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Finding the Fourth Proportional to 521.71, 719.95 and 282.44

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Solution

The fourth proportional to 521.71, 719.95 and 282.44 is: 389.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.71 : 719.95 = 282.44 : x
  2. Step 2: Convert to fraction form
    521.71/719.95 = 282.44/x
  3. Step 3: Cross multiply
    521.71x = 719.95 × 282.44
  4. Step 4: Simplify right side
    521.71x = 203,340.85
  5. Step 5: Solve for x
    x = 203,340.85/521.71
  6. Step 6: Final answer
    x = 389.76

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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.