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Finding the Fourth Proportional to 939.72, 1,296.12 and 546.72

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Solution

The fourth proportional to 939.72, 1,296.12 and 546.72 is: 754.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.72 : 1,296.12 = 546.72 : x
  2. Step 2: Convert to fraction form
    939.72/1,296.12 = 546.72/x
  3. Step 3: Cross multiply
    939.72x = 1,296.12 × 546.72
  4. Step 4: Simplify right side
    939.72x = 708,614.73
  5. Step 5: Solve for x
    x = 708,614.73/939.72
  6. Step 6: Final answer
    x = 754.07

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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.