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Finding the Fourth Proportional to 747.32, 1,121.10 and 253.64

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Solution

The fourth proportional to 747.32, 1,121.10 and 253.64 is: 380.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.32 : 1,121.10 = 253.64 : x
  2. Step 2: Convert to fraction form
    747.32/1,121.10 = 253.64/x
  3. Step 3: Cross multiply
    747.32x = 1,121.10 × 253.64
  4. Step 4: Simplify right side
    747.32x = 284,355.80
  5. Step 5: Solve for x
    x = 284,355.80/747.32
  6. Step 6: Final answer
    x = 380.50

Related Problems

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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.