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Finding the Fourth Proportional to 718.56, 990.96 and 521.76

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Solution

The fourth proportional to 718.56, 990.96 and 521.76 is: 719.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.56 : 990.96 = 521.76 : x
  2. Step 2: Convert to fraction form
    718.56/990.96 = 521.76/x
  3. Step 3: Cross multiply
    718.56x = 990.96 × 521.76
  4. Step 4: Simplify right side
    718.56x = 517,043.29
  5. Step 5: Solve for x
    x = 517,043.29/718.56
  6. Step 6: Final answer
    x = 719.55

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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.