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Finding the Fourth Proportional to 12,489.52, 17,238.96 and 7,771

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Solution

The fourth proportional to 12,489.52, 17,238.96 and 7,771 is: 10,726.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.52 : 17,238.96 = 7,771 : x
  2. Step 2: Convert to fraction form
    12,489.52/17,238.96 = 7,771/x
  3. Step 3: Cross multiply
    12,489.52x = 17,238.96 × 7,771
  4. Step 4: Simplify right side
    12,489.52x = 133,963,958.16
  5. Step 5: Solve for x
    x = 133,963,958.16/12,489.52
  6. Step 6: Final answer
    x = 10,726.11

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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.