Home / 28,720.68-43,081.02-9,000.78

Finding the Fourth Proportional to 28,720.68, 43,081.02 and 9,000.78

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Solution

The fourth proportional to 28,720.68, 43,081.02 and 9,000.78 is: 13,501.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,720.68 : 43,081.02 = 9,000.78 : x
  2. Step 2: Convert to fraction form
    28,720.68/43,081.02 = 9,000.78/x
  3. Step 3: Cross multiply
    28,720.68x = 43,081.02 × 9,000.78
  4. Step 4: Simplify right side
    28,720.68x = 387,762,783.20
  5. Step 5: Solve for x
    x = 387,762,783.20/28,720.68
  6. Step 6: Final answer
    x = 13,501.17

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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.