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Finding the Fourth Proportional to 862.79, 1,294.28 and 424.20

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Solution

The fourth proportional to 862.79, 1,294.28 and 424.20 is: 636.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.79 : 1,294.28 = 424.20 : x
  2. Step 2: Convert to fraction form
    862.79/1,294.28 = 424.20/x
  3. Step 3: Cross multiply
    862.79x = 1,294.28 × 424.20
  4. Step 4: Simplify right side
    862.79x = 549,033.58
  5. Step 5: Solve for x
    x = 549,033.58/862.79
  6. Step 6: Final answer
    x = 636.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.