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Finding the Fourth Proportional to 12,489.72, 17,253.54 and 9,988.44

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Solution

The fourth proportional to 12,489.72, 17,253.54 and 9,988.44 is: 13,798.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.72 : 17,253.54 = 9,988.44 : x
  2. Step 2: Convert to fraction form
    12,489.72/17,253.54 = 9,988.44/x
  3. Step 3: Cross multiply
    12,489.72x = 17,253.54 × 9,988.44
  4. Step 4: Simplify right side
    12,489.72x = 172,335,949.08
  5. Step 5: Solve for x
    x = 172,335,949.08/12,489.72
  6. Step 6: Final answer
    x = 13,798.22

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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.