Home / 21,120.86-29,147.10-11,689.76

Finding the Fourth Proportional to 21,120.86, 29,147.10 and 11,689.76

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Solution

The fourth proportional to 21,120.86, 29,147.10 and 11,689.76 is: 16,132.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.86 : 29,147.10 = 11,689.76 : x
  2. Step 2: Convert to fraction form
    21,120.86/29,147.10 = 11,689.76/x
  3. Step 3: Cross multiply
    21,120.86x = 29,147.10 × 11,689.76
  4. Step 4: Simplify right side
    21,120.86x = 340,722,603.70
  5. Step 5: Solve for x
    x = 340,722,603.70/21,120.86
  6. Step 6: Final answer
    x = 16,132.04

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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.