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Finding the Fourth Proportional to 521.18, 719.26 and 324.76

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Solution

The fourth proportional to 521.18, 719.26 and 324.76 is: 448.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.18 : 719.26 = 324.76 : x
  2. Step 2: Convert to fraction form
    521.18/719.26 = 324.76/x
  3. Step 3: Cross multiply
    521.18x = 719.26 × 324.76
  4. Step 4: Simplify right side
    521.18x = 233,584.27
  5. Step 5: Solve for x
    x = 233,584.27/521.18
  6. Step 6: Final answer
    x = 448.18

Related Problems

Find fourth proportional to 260.59, 359.63 and 162.38
Half scale
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Double scale
Find fourth proportional to 522.18, 720.64 and 325.76
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.