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Finding the Fourth Proportional to 748.72, 1,123.12 and 424.72

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Solution

The fourth proportional to 748.72, 1,123.12 and 424.72 is: 637.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.72 : 1,123.12 = 424.72 : x
  2. Step 2: Convert to fraction form
    748.72/1,123.12 = 424.72/x
  3. Step 3: Cross multiply
    748.72x = 1,123.12 × 424.72
  4. Step 4: Simplify right side
    748.72x = 477,011.53
  5. Step 5: Solve for x
    x = 477,011.53/748.72
  6. Step 6: Final answer
    x = 637.10

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1.5x scale

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.