Home / 21,121.12-29,148.05-11,689.68

Finding the Fourth Proportional to 21,121.12, 29,148.05 and 11,689.68

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Solution

The fourth proportional to 21,121.12, 29,148.05 and 11,689.68 is: 16,132.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.12 : 29,148.05 = 11,689.68 : x
  2. Step 2: Convert to fraction form
    21,121.12/29,148.05 = 11,689.68/x
  3. Step 3: Cross multiply
    21,121.12x = 29,148.05 × 11,689.68
  4. Step 4: Simplify right side
    21,121.12x = 340,731,377.12
  5. Step 5: Solve for x
    x = 340,731,377.12/21,121.12
  6. Step 6: Final answer
    x = 16,132.26

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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.