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Finding the Fourth Proportional to 748.20, 1,121.40 and 383.08

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Solution

The fourth proportional to 748.20, 1,121.40 and 383.08 is: 574.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.20 : 1,121.40 = 383.08 : x
  2. Step 2: Convert to fraction form
    748.20/1,121.40 = 383.08/x
  3. Step 3: Cross multiply
    748.20x = 1,121.40 × 383.08
  4. Step 4: Simplify right side
    748.20x = 429,585.91
  5. Step 5: Solve for x
    x = 429,585.91/748.20
  6. Step 6: Final answer
    x = 574.16

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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.