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Finding the Fourth Proportional to 15,660.63, 21,610.89 and 8,854.47

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Solution

The fourth proportional to 15,660.63, 21,610.89 and 8,854.47 is: 12,218.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,660.63 : 21,610.89 = 8,854.47 : x
  2. Step 2: Convert to fraction form
    15,660.63/21,610.89 = 8,854.47/x
  3. Step 3: Cross multiply
    15,660.63x = 21,610.89 × 8,854.47
  4. Step 4: Simplify right side
    15,660.63x = 191,352,977.18
  5. Step 5: Solve for x
    x = 191,352,977.18/15,660.63
  6. Step 6: Final answer
    x = 12,218.73

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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.