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Finding the Fourth Proportional to 718.18, 990.96 and 521.78

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Solution

The fourth proportional to 718.18, 990.96 and 521.78 is: 719.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.18 : 990.96 = 521.78 : x
  2. Step 2: Convert to fraction form
    718.18/990.96 = 521.78/x
  3. Step 3: Cross multiply
    718.18x = 990.96 × 521.78
  4. Step 4: Simplify right side
    718.18x = 517,063.11
  5. Step 5: Solve for x
    x = 517,063.11/718.18
  6. Step 6: Final answer
    x = 719.96

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