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Finding the Fourth Proportional to 748.85, 1,123.40 and 612.43

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Solution

The fourth proportional to 748.85, 1,123.40 and 612.43 is: 918.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.85 : 1,123.40 = 612.43 : x
  2. Step 2: Convert to fraction form
    748.85/1,123.40 = 612.43/x
  3. Step 3: Cross multiply
    748.85x = 1,123.40 × 612.43
  4. Step 4: Simplify right side
    748.85x = 688,002.58
  5. Step 5: Solve for x
    x = 688,002.58/748.85
  6. Step 6: Final answer
    x = 918.75

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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.