Home / 21,191.78-29,241.68-12,691.91

Finding the Fourth Proportional to 21,191.78, 29,241.68 and 12,691.91

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Solution

The fourth proportional to 21,191.78, 29,241.68 and 12,691.91 is: 17,513.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,191.78 : 29,241.68 = 12,691.91 : x
  2. Step 2: Convert to fraction form
    21,191.78/29,241.68 = 12,691.91/x
  3. Step 3: Cross multiply
    21,191.78x = 29,241.68 × 12,691.91
  4. Step 4: Simplify right side
    21,191.78x = 371,132,780.45
  5. Step 5: Solve for x
    x = 371,132,780.45/21,191.78
  6. Step 6: Final answer
    x = 17,513.05

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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.