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Finding the Fourth Proportional to 520.61, 781.12 and 315.33

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Solution

The fourth proportional to 520.61, 781.12 and 315.33 is: 473.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.61 : 781.12 = 315.33 : x
  2. Step 2: Convert to fraction form
    520.61/781.12 = 315.33/x
  3. Step 3: Cross multiply
    520.61x = 781.12 × 315.33
  4. Step 4: Simplify right side
    520.61x = 246,307.15
  5. Step 5: Solve for x
    x = 246,307.15/520.61
  6. Step 6: Final answer
    x = 473.11

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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.