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Finding the Fourth Proportional to 521.34, 718.95 and 371.91

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Solution

The fourth proportional to 521.34, 718.95 and 371.91 is: 512.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.34 : 718.95 = 371.91 : x
  2. Step 2: Convert to fraction form
    521.34/718.95 = 371.91/x
  3. Step 3: Cross multiply
    521.34x = 718.95 × 371.91
  4. Step 4: Simplify right side
    521.34x = 267,384.69
  5. Step 5: Solve for x
    x = 267,384.69/521.34
  6. Step 6: Final answer
    x = 512.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.