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Finding the Fourth Proportional to 951, 1,425.72 and 638.98

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Solution

The fourth proportional to 951, 1,425.72 and 638.98 is: 957.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    951 : 1,425.72 = 638.98 : x
  2. Step 2: Convert to fraction form
    951/1,425.72 = 638.98/x
  3. Step 3: Cross multiply
    951x = 1,425.72 × 638.98
  4. Step 4: Simplify right side
    951x = 911,006.57
  5. Step 5: Solve for x
    x = 911,006.57/951
  6. Step 6: Final answer
    x = 957.95

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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.