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Finding the Fourth Proportional to 749.58, 1,124.39 and 640.68

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Solution

The fourth proportional to 749.58, 1,124.39 and 640.68 is: 961.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.58 : 1,124.39 = 640.68 : x
  2. Step 2: Convert to fraction form
    749.58/1,124.39 = 640.68/x
  3. Step 3: Cross multiply
    749.58x = 1,124.39 × 640.68
  4. Step 4: Simplify right side
    749.58x = 720,374.19
  5. Step 5: Solve for x
    x = 720,374.19/749.58
  6. Step 6: Final answer
    x = 961.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.