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Finding the Fourth Proportional to 520.99, 781.22 and 155.68

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Solution

The fourth proportional to 520.99, 781.22 and 155.68 is: 233.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.99 : 781.22 = 155.68 : x
  2. Step 2: Convert to fraction form
    520.99/781.22 = 155.68/x
  3. Step 3: Cross multiply
    520.99x = 781.22 × 155.68
  4. Step 4: Simplify right side
    520.99x = 121,618.77
  5. Step 5: Solve for x
    x = 121,618.77/520.99
  6. Step 6: Final answer
    x = 233.44

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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.