Home / 21,117.52-29,143.92-11,689.12

Finding the Fourth Proportional to 21,117.52, 29,143.92 and 11,689.12

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Solution

The fourth proportional to 21,117.52, 29,143.92 and 11,689.12 is: 16,131.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,117.52 : 29,143.92 = 11,689.12 : x
  2. Step 2: Convert to fraction form
    21,117.52/29,143.92 = 11,689.12/x
  3. Step 3: Cross multiply
    21,117.52x = 29,143.92 × 11,689.12
  4. Step 4: Simplify right side
    21,117.52x = 340,666,778.15
  5. Step 5: Solve for x
    x = 340,666,778.15/21,117.52
  6. Step 6: Final answer
    x = 16,131.95

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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.