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Finding the Fourth Proportional to 718.49, 991.49 and 403.75

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Solution

The fourth proportional to 718.49, 991.49 and 403.75 is: 557.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.49 : 991.49 = 403.75 : x
  2. Step 2: Convert to fraction form
    718.49/991.49 = 403.75/x
  3. Step 3: Cross multiply
    718.49x = 991.49 × 403.75
  4. Step 4: Simplify right side
    718.49x = 400,312.62
  5. Step 5: Solve for x
    x = 400,312.62/718.49
  6. Step 6: Final answer
    x = 557.16

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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.