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Finding the Fourth Proportional to 15,876.54, 21,909.78 and 9,908.28

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Solution

The fourth proportional to 15,876.54, 21,909.78 and 9,908.28 is: 13,673.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,876.54 : 21,909.78 = 9,908.28 : x
  2. Step 2: Convert to fraction form
    15,876.54/21,909.78 = 9,908.28/x
  3. Step 3: Cross multiply
    15,876.54x = 21,909.78 × 9,908.28
  4. Step 4: Simplify right side
    15,876.54x = 217,088,234.98
  5. Step 5: Solve for x
    x = 217,088,234.98/15,876.54
  6. Step 6: Final answer
    x = 13,673.52

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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.