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Finding the Fourth Proportional to 939.64, 1,296.68 and 546.74

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Solution

The fourth proportional to 939.64, 1,296.68 and 546.74 is: 754.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.64 : 1,296.68 = 546.74 : x
  2. Step 2: Convert to fraction form
    939.64/1,296.68 = 546.74/x
  3. Step 3: Cross multiply
    939.64x = 1,296.68 × 546.74
  4. Step 4: Simplify right side
    939.64x = 708,946.82
  5. Step 5: Solve for x
    x = 708,946.82/939.64
  6. Step 6: Final answer
    x = 754.49

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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.