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Finding the Fourth Proportional to 748.74, 1,123.16 and 315.75

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Solution

The fourth proportional to 748.74, 1,123.16 and 315.75 is: 473.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.74 : 1,123.16 = 315.75 : x
  2. Step 2: Convert to fraction form
    748.74/1,123.16 = 315.75/x
  3. Step 3: Cross multiply
    748.74x = 1,123.16 × 315.75
  4. Step 4: Simplify right side
    748.74x = 354,636.19
  5. Step 5: Solve for x
    x = 354,636.19/748.74
  6. Step 6: Final answer
    x = 473.64

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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.