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Finding the Fourth Proportional to 1,332.57, 1,997.61 and 638.89

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Solution

The fourth proportional to 1,332.57, 1,997.61 and 638.89 is: 957.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.57 : 1,997.61 = 638.89 : x
  2. Step 2: Convert to fraction form
    1,332.57/1,997.61 = 638.89/x
  3. Step 3: Cross multiply
    1,332.57x = 1,997.61 × 638.89
  4. Step 4: Simplify right side
    1,332.57x = 1,276,253.05
  5. Step 5: Solve for x
    x = 1,276,253.05/1,332.57
  6. Step 6: Final answer
    x = 957.74

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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.