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Finding the Fourth Proportional to 862.66, 1,294.18 and 285.40

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Solution

The fourth proportional to 862.66, 1,294.18 and 285.40 is: 428.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.66 : 1,294.18 = 285.40 : x
  2. Step 2: Convert to fraction form
    862.66/1,294.18 = 285.40/x
  3. Step 3: Cross multiply
    862.66x = 1,294.18 × 285.40
  4. Step 4: Simplify right side
    862.66x = 369,358.97
  5. Step 5: Solve for x
    x = 369,358.97/862.66
  6. Step 6: Final answer
    x = 428.16

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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.