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Finding the Fourth Proportional to 1,031.38, 1,423.29 and 638.50

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Solution

The fourth proportional to 1,031.38, 1,423.29 and 638.50 is: 881.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.38 : 1,423.29 = 638.50 : x
  2. Step 2: Convert to fraction form
    1,031.38/1,423.29 = 638.50/x
  3. Step 3: Cross multiply
    1,031.38x = 1,423.29 × 638.50
  4. Step 4: Simplify right side
    1,031.38x = 908,770.67
  5. Step 5: Solve for x
    x = 908,770.67/1,031.38
  6. Step 6: Final answer
    x = 881.12

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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.