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Finding the Fourth Proportional to 520.71, 781.19 and 155.50

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Solution

The fourth proportional to 520.71, 781.19 and 155.50 is: 233.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.71 : 781.19 = 155.50 : x
  2. Step 2: Convert to fraction form
    520.71/781.19 = 155.50/x
  3. Step 3: Cross multiply
    520.71x = 781.19 × 155.50
  4. Step 4: Simplify right side
    520.71x = 121,473.77
  5. Step 5: Solve for x
    x = 121,473.77/520.71
  6. Step 6: Final answer
    x = 233.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.