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Finding the Fourth Proportional to 939.68, 1,296.72 and 546.72

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Solution

The fourth proportional to 939.68, 1,296.72 and 546.72 is: 754.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.68 : 1,296.72 = 546.72 : x
  2. Step 2: Convert to fraction form
    939.68/1,296.72 = 546.72/x
  3. Step 3: Cross multiply
    939.68x = 1,296.72 × 546.72
  4. Step 4: Simplify right side
    939.68x = 708,942.76
  5. Step 5: Solve for x
    x = 708,942.76/939.68
  6. Step 6: Final answer
    x = 754.45

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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.