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Finding the Fourth Proportional to 521.61, 782.76 and 479.91

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Solution

The fourth proportional to 521.61, 782.76 and 479.91 is: 720.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.61 : 782.76 = 479.91 : x
  2. Step 2: Convert to fraction form
    521.61/782.76 = 479.91/x
  3. Step 3: Cross multiply
    521.61x = 782.76 × 479.91
  4. Step 4: Simplify right side
    521.61x = 375,654.35
  5. Step 5: Solve for x
    x = 375,654.35/521.61
  6. Step 6: Final answer
    x = 720.18

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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.