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Finding the Fourth Proportional to 11,423.20, 17,118.80 and 9,087.20

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Solution

The fourth proportional to 11,423.20, 17,118.80 and 9,087.20 is: 13,618.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,423.20 : 17,118.80 = 9,087.20 : x
  2. Step 2: Convert to fraction form
    11,423.20/17,118.80 = 9,087.20/x
  3. Step 3: Cross multiply
    11,423.20x = 17,118.80 × 9,087.20
  4. Step 4: Simplify right side
    11,423.20x = 155,561,959.36
  5. Step 5: Solve for x
    x = 155,561,959.36/11,423.20
  6. Step 6: Final answer
    x = 13,618.07

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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.