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Finding the Fourth Proportional to 749.85, 1,124.90 and 613.43

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Solution

The fourth proportional to 749.85, 1,124.90 and 613.43 is: 920.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.85 : 1,124.90 = 613.43 : x
  2. Step 2: Convert to fraction form
    749.85/1,124.90 = 613.43/x
  3. Step 3: Cross multiply
    749.85x = 1,124.90 × 613.43
  4. Step 4: Simplify right side
    749.85x = 690,047.41
  5. Step 5: Solve for x
    x = 690,047.41/749.85
  6. Step 6: Final answer
    x = 920.25

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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.