Home / 21,720.31-29,974.17-12,290.74

Finding the Fourth Proportional to 21,720.31, 29,974.17 and 12,290.74

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Solution

The fourth proportional to 21,720.31, 29,974.17 and 12,290.74 is: 16,961.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.31 : 29,974.17 = 12,290.74 : x
  2. Step 2: Convert to fraction form
    21,720.31/29,974.17 = 12,290.74/x
  3. Step 3: Cross multiply
    21,720.31x = 29,974.17 × 12,290.74
  4. Step 4: Simplify right side
    21,720.31x = 368,404,730.19
  5. Step 5: Solve for x
    x = 368,404,730.19/21,720.31
  6. Step 6: Final answer
    x = 16,961.30

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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.