Home / 15,287.20-21,097.56-9,000.80

Finding the Fourth Proportional to 15,287.20, 21,097.56 and 9,000.80

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Solution

The fourth proportional to 15,287.20, 21,097.56 and 9,000.80 is: 12,421.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,287.20 : 21,097.56 = 9,000.80 : x
  2. Step 2: Convert to fraction form
    15,287.20/21,097.56 = 9,000.80/x
  3. Step 3: Cross multiply
    15,287.20x = 21,097.56 × 9,000.80
  4. Step 4: Simplify right side
    15,287.20x = 189,894,918.05
  5. Step 5: Solve for x
    x = 189,894,918.05/15,287.20
  6. Step 6: Final answer
    x = 12,421.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.