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Finding the Fourth Proportional to 718.82, 992.14 and 424.20

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Solution

The fourth proportional to 718.82, 992.14 and 424.20 is: 585.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.82 : 992.14 = 424.20 : x
  2. Step 2: Convert to fraction form
    718.82/992.14 = 424.20/x
  3. Step 3: Cross multiply
    718.82x = 992.14 × 424.20
  4. Step 4: Simplify right side
    718.82x = 420,865.79
  5. Step 5: Solve for x
    x = 420,865.79/718.82
  6. Step 6: Final answer
    x = 585.50

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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.