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Finding the Fourth Proportional to 748.56, 1,122.78 and 315.72

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Solution

The fourth proportional to 748.56, 1,122.78 and 315.72 is: 473.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.56 : 1,122.78 = 315.72 : x
  2. Step 2: Convert to fraction form
    748.56/1,122.78 = 315.72/x
  3. Step 3: Cross multiply
    748.56x = 1,122.78 × 315.72
  4. Step 4: Simplify right side
    748.56x = 354,484.10
  5. Step 5: Solve for x
    x = 354,484.10/748.56
  6. Step 6: Final answer
    x = 473.55

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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.