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Finding the Fourth Proportional to 748.90, 1,123.04 and 315.75

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Solution

The fourth proportional to 748.90, 1,123.04 and 315.75 is: 473.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.90 : 1,123.04 = 315.75 : x
  2. Step 2: Convert to fraction form
    748.90/1,123.04 = 315.75/x
  3. Step 3: Cross multiply
    748.90x = 1,123.04 × 315.75
  4. Step 4: Simplify right side
    748.90x = 354,600.67
  5. Step 5: Solve for x
    x = 354,600.67/748.90
  6. Step 6: Final answer
    x = 473.50

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Half scale
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Double scale
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Similar ratio
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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.