Home / 5,280.40-7,919.20-1,581.76

Finding the Fourth Proportional to 5,280.40, 7,919.20 and 1,581.76

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Solution

The fourth proportional to 5,280.40, 7,919.20 and 1,581.76 is: 2,372.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.40 : 7,919.20 = 1,581.76 : x
  2. Step 2: Convert to fraction form
    5,280.40/7,919.20 = 1,581.76/x
  3. Step 3: Cross multiply
    5,280.40x = 7,919.20 × 1,581.76
  4. Step 4: Simplify right side
    5,280.40x = 12,526,273.79
  5. Step 5: Solve for x
    x = 12,526,273.79/5,280.40
  6. Step 6: Final answer
    x = 2,372.22

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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.