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Finding the Fourth Proportional to 939.12, 1,296.02 and 546.28

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Solution

The fourth proportional to 939.12, 1,296.02 and 546.28 is: 753.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.12 : 1,296.02 = 546.28 : x
  2. Step 2: Convert to fraction form
    939.12/1,296.02 = 546.28/x
  3. Step 3: Cross multiply
    939.12x = 1,296.02 × 546.28
  4. Step 4: Simplify right side
    939.12x = 707,989.81
  5. Step 5: Solve for x
    x = 707,989.81/939.12
  6. Step 6: Final answer
    x = 753.89

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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.