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Finding the Fourth Proportional to 718.72, 991.87 and 424.08

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Solution

The fourth proportional to 718.72, 991.87 and 424.08 is: 585.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.72 : 991.87 = 424.08 : x
  2. Step 2: Convert to fraction form
    718.72/991.87 = 424.08/x
  3. Step 3: Cross multiply
    718.72x = 991.87 × 424.08
  4. Step 4: Simplify right side
    718.72x = 420,632.23
  5. Step 5: Solve for x
    x = 420,632.23/718.72
  6. Step 6: Final answer
    x = 585.25

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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.