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Finding the Fourth Proportional to 15,853.56, 21,876.05 and 9,139.11

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Solution

The fourth proportional to 15,853.56, 21,876.05 and 9,139.11 is: 12,610.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,853.56 : 21,876.05 = 9,139.11 : x
  2. Step 2: Convert to fraction form
    15,853.56/21,876.05 = 9,139.11/x
  3. Step 3: Cross multiply
    15,853.56x = 21,876.05 × 9,139.11
  4. Step 4: Simplify right side
    15,853.56x = 199,927,581.62
  5. Step 5: Solve for x
    x = 199,927,581.62/15,853.56
  6. Step 6: Final answer
    x = 12,610.90

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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.