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Finding the Fourth Proportional to 521.46, 781.79 and 286.83

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Solution

The fourth proportional to 521.46, 781.79 and 286.83 is: 430.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.46 : 781.79 = 286.83 : x
  2. Step 2: Convert to fraction form
    521.46/781.79 = 286.83/x
  3. Step 3: Cross multiply
    521.46x = 781.79 × 286.83
  4. Step 4: Simplify right side
    521.46x = 224,239.39
  5. Step 5: Solve for x
    x = 224,239.39/521.46
  6. Step 6: Final answer
    x = 430.02

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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.