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Finding the Fourth Proportional to 2,420.76, 3,340.64 and 1,316.76

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Solution

The fourth proportional to 2,420.76, 3,340.64 and 1,316.76 is: 1,817.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.76 : 3,340.64 = 1,316.76 : x
  2. Step 2: Convert to fraction form
    2,420.76/3,340.64 = 1,316.76/x
  3. Step 3: Cross multiply
    2,420.76x = 3,340.64 × 1,316.76
  4. Step 4: Simplify right side
    2,420.76x = 4,398,821.13
  5. Step 5: Solve for x
    x = 4,398,821.13/2,420.76
  6. Step 6: Final answer
    x = 1,817.12

Related Problems

Find fourth proportional to 1,210.38, 1,670.32 and 658.38
Half scale
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Double scale
Find fourth proportional to 2,421.76, 3,342.02 and 1,317.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.