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Finding the Fourth Proportional to 15,481.47, 21,364.65 and 8,407.88

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Solution

The fourth proportional to 15,481.47, 21,364.65 and 8,407.88 is: 11,602.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,481.47 : 21,364.65 = 8,407.88 : x
  2. Step 2: Convert to fraction form
    15,481.47/21,364.65 = 8,407.88/x
  3. Step 3: Cross multiply
    15,481.47x = 21,364.65 × 8,407.88
  4. Step 4: Simplify right side
    15,481.47x = 179,631,306.62
  5. Step 5: Solve for x
    x = 179,631,306.62/15,481.47
  6. Step 6: Final answer
    x = 11,602.99

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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.