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Finding the Fourth Proportional to 15,005.31, 20,691.81 and 12,887.88

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Solution

The fourth proportional to 15,005.31, 20,691.81 and 12,887.88 is: 17,771.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,005.31 : 20,691.81 = 12,887.88 : x
  2. Step 2: Convert to fraction form
    15,005.31/20,691.81 = 12,887.88/x
  3. Step 3: Cross multiply
    15,005.31x = 20,691.81 × 12,887.88
  4. Step 4: Simplify right side
    15,005.31x = 266,673,564.26
  5. Step 5: Solve for x
    x = 266,673,564.26/15,005.31
  6. Step 6: Final answer
    x = 17,771.95

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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.