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Finding the Fourth Proportional to 523.80, 781.92 and 459

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Solution

The fourth proportional to 523.80, 781.92 and 459 is: 685.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.80 : 781.92 = 459 : x
  2. Step 2: Convert to fraction form
    523.80/781.92 = 459/x
  3. Step 3: Cross multiply
    523.80x = 781.92 × 459
  4. Step 4: Simplify right side
    523.80x = 358,901.28
  5. Step 5: Solve for x
    x = 358,901.28/523.80
  6. Step 6: Final answer
    x = 685.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.