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Finding the Fourth Proportional to 5,280.12, 7,921.08 and 2,648.88

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Solution

The fourth proportional to 5,280.12, 7,921.08 and 2,648.88 is: 3,973.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.12 : 7,921.08 = 2,648.88 : x
  2. Step 2: Convert to fraction form
    5,280.12/7,921.08 = 2,648.88/x
  3. Step 3: Cross multiply
    5,280.12x = 7,921.08 × 2,648.88
  4. Step 4: Simplify right side
    5,280.12x = 20,981,990.39
  5. Step 5: Solve for x
    x = 20,981,990.39/5,280.12
  6. Step 6: Final answer
    x = 3,973.77

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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.