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Finding the Fourth Proportional to 637.92, 879.48 and 558.40

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Solution

The fourth proportional to 637.92, 879.48 and 558.40 is: 769.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.92 : 879.48 = 558.40 : x
  2. Step 2: Convert to fraction form
    637.92/879.48 = 558.40/x
  3. Step 3: Cross multiply
    637.92x = 879.48 × 558.40
  4. Step 4: Simplify right side
    637.92x = 491,101.63
  5. Step 5: Solve for x
    x = 491,101.63/637.92
  6. Step 6: Final answer
    x = 769.85

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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.