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Finding the Fourth Proportional to 520.13, 780.20 and 135.38

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Solution

The fourth proportional to 520.13, 780.20 and 135.38 is: 203.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.13 : 780.20 = 135.38 : x
  2. Step 2: Convert to fraction form
    520.13/780.20 = 135.38/x
  3. Step 3: Cross multiply
    520.13x = 780.20 × 135.38
  4. Step 4: Simplify right side
    520.13x = 105,618.90
  5. Step 5: Solve for x
    x = 105,618.90/520.13
  6. Step 6: Final answer
    x = 203.06

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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.