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Finding the Fourth Proportional to 1,420.76, 1,960.70 and 861.12

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Solution

The fourth proportional to 1,420.76, 1,960.70 and 861.12 is: 1,188.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.76 : 1,960.70 = 861.12 : x
  2. Step 2: Convert to fraction form
    1,420.76/1,960.70 = 861.12/x
  3. Step 3: Cross multiply
    1,420.76x = 1,960.70 × 861.12
  4. Step 4: Simplify right side
    1,420.76x = 1,688,393.68
  5. Step 5: Solve for x
    x = 1,688,393.68/1,420.76
  6. Step 6: Final answer
    x = 1,188.37

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Double scale
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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.