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Finding the Fourth Proportional to 718.17, 990.79 and 456.13

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Solution

The fourth proportional to 718.17, 990.79 and 456.13 is: 629.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.17 : 990.79 = 456.13 : x
  2. Step 2: Convert to fraction form
    718.17/990.79 = 456.13/x
  3. Step 3: Cross multiply
    718.17x = 990.79 × 456.13
  4. Step 4: Simplify right side
    718.17x = 451,929.04
  5. Step 5: Solve for x
    x = 451,929.04/718.17
  6. Step 6: Final answer
    x = 629.28

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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.