Home / 12,480.28-18,720.36-3,715.20

Finding the Fourth Proportional to 12,480.28, 18,720.36 and 3,715.20

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Solution

The fourth proportional to 12,480.28, 18,720.36 and 3,715.20 is: 5,572.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.28 : 18,720.36 = 3,715.20 : x
  2. Step 2: Convert to fraction form
    12,480.28/18,720.36 = 3,715.20/x
  3. Step 3: Cross multiply
    12,480.28x = 18,720.36 × 3,715.20
  4. Step 4: Simplify right side
    12,480.28x = 69,549,881.47
  5. Step 5: Solve for x
    x = 69,549,881.47/12,480.28
  6. Step 6: Final answer
    x = 5,572.78

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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.