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Finding the Fourth Proportional to 743.60, 1,025.17 and 638.24

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Solution

The fourth proportional to 743.60, 1,025.17 and 638.24 is: 879.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.60 : 1,025.17 = 638.24 : x
  2. Step 2: Convert to fraction form
    743.60/1,025.17 = 638.24/x
  3. Step 3: Cross multiply
    743.60x = 1,025.17 × 638.24
  4. Step 4: Simplify right side
    743.60x = 654,299.37
  5. Step 5: Solve for x
    x = 654,299.37/743.60
  6. Step 6: Final answer
    x = 879.91

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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.