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Finding the Fourth Proportional to 5,280.80, 7,921.20 and 1,385.12

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Solution

The fourth proportional to 5,280.80, 7,921.20 and 1,385.12 is: 2,077.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.80 : 7,921.20 = 1,385.12 : x
  2. Step 2: Convert to fraction form
    5,280.80/7,921.20 = 1,385.12/x
  3. Step 3: Cross multiply
    5,280.80x = 7,921.20 × 1,385.12
  4. Step 4: Simplify right side
    5,280.80x = 10,971,812.54
  5. Step 5: Solve for x
    x = 10,971,812.54/5,280.80
  6. Step 6: Final answer
    x = 2,077.68

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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.