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Finding the Fourth Proportional to 748.90, 1,123.95 and 383.79

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Solution

The fourth proportional to 748.90, 1,123.95 and 383.79 is: 575.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.90 : 1,123.95 = 383.79 : x
  2. Step 2: Convert to fraction form
    748.90/1,123.95 = 383.79/x
  3. Step 3: Cross multiply
    748.90x = 1,123.95 × 383.79
  4. Step 4: Simplify right side
    748.90x = 431,359.02
  5. Step 5: Solve for x
    x = 431,359.02/748.90
  6. Step 6: Final answer
    x = 575.99

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Double scale
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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.