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Finding the Fourth Proportional to 718.56, 991.62 and 408.06

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Solution

The fourth proportional to 718.56, 991.62 and 408.06 is: 563.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.56 : 991.62 = 408.06 : x
  2. Step 2: Convert to fraction form
    718.56/991.62 = 408.06/x
  3. Step 3: Cross multiply
    718.56x = 991.62 × 408.06
  4. Step 4: Simplify right side
    718.56x = 404,640.46
  5. Step 5: Solve for x
    x = 404,640.46/718.56
  6. Step 6: Final answer
    x = 563.13

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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.