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Finding the Fourth Proportional to 521.76, 781.61 and 347.91

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Solution

The fourth proportional to 521.76, 781.61 and 347.91 is: 521.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.76 : 781.61 = 347.91 : x
  2. Step 2: Convert to fraction form
    521.76/781.61 = 347.91/x
  3. Step 3: Cross multiply
    521.76x = 781.61 × 347.91
  4. Step 4: Simplify right side
    521.76x = 271,928.20
  5. Step 5: Solve for x
    x = 271,928.20/521.76
  6. Step 6: Final answer
    x = 521.17

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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.