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Finding the Fourth Proportional to 1,672.08, 2,308.64 and 1,042.88

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Solution

The fourth proportional to 1,672.08, 2,308.64 and 1,042.88 is: 1,439.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.08 : 2,308.64 = 1,042.88 : x
  2. Step 2: Convert to fraction form
    1,672.08/2,308.64 = 1,042.88/x
  3. Step 3: Cross multiply
    1,672.08x = 2,308.64 × 1,042.88
  4. Step 4: Simplify right side
    1,672.08x = 2,407,634.48
  5. Step 5: Solve for x
    x = 2,407,634.48/1,672.08
  6. Step 6: Final answer
    x = 1,439.90

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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.