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Finding the Fourth Proportional to 1,043.72, 1,439.70 and 689.64

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Solution

The fourth proportional to 1,043.72, 1,439.70 and 689.64 is: 951.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.72 : 1,439.70 = 689.64 : x
  2. Step 2: Convert to fraction form
    1,043.72/1,439.70 = 689.64/x
  3. Step 3: Cross multiply
    1,043.72x = 1,439.70 × 689.64
  4. Step 4: Simplify right side
    1,043.72x = 992,874.71
  5. Step 5: Solve for x
    x = 992,874.71/1,043.72
  6. Step 6: Final answer
    x = 951.28

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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.