Home / 20,387.50-30,568.96-9,140.80

Finding the Fourth Proportional to 20,387.50, 30,568.96 and 9,140.80

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Solution

The fourth proportional to 20,387.50, 30,568.96 and 9,140.80 is: 13,705.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.50 : 30,568.96 = 9,140.80 : x
  2. Step 2: Convert to fraction form
    20,387.50/30,568.96 = 9,140.80/x
  3. Step 3: Cross multiply
    20,387.50x = 30,568.96 × 9,140.80
  4. Step 4: Simplify right side
    20,387.50x = 279,424,800.05
  5. Step 5: Solve for x
    x = 279,424,800.05/20,387.50
  6. Step 6: Final answer
    x = 13,705.69

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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.