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Finding the Fourth Proportional to 1,031.72, 1,548.22 and 642.49

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Solution

The fourth proportional to 1,031.72, 1,548.22 and 642.49 is: 964.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.72 : 1,548.22 = 642.49 : x
  2. Step 2: Convert to fraction form
    1,031.72/1,548.22 = 642.49/x
  3. Step 3: Cross multiply
    1,031.72x = 1,548.22 × 642.49
  4. Step 4: Simplify right side
    1,031.72x = 994,709.73
  5. Step 5: Solve for x
    x = 994,709.73/1,031.72
  6. Step 6: Final answer
    x = 964.13

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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.