Home / 21,115.19-29,131.88-12,162.48

Finding the Fourth Proportional to 21,115.19, 29,131.88 and 12,162.48

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Solution

The fourth proportional to 21,115.19, 29,131.88 and 12,162.48 is: 16,780.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.19 : 29,131.88 = 12,162.48 : x
  2. Step 2: Convert to fraction form
    21,115.19/29,131.88 = 12,162.48/x
  3. Step 3: Cross multiply
    21,115.19x = 29,131.88 × 12,162.48
  4. Step 4: Simplify right side
    21,115.19x = 354,316,011.10
  5. Step 5: Solve for x
    x = 354,316,011.10/21,115.19
  6. Step 6: Final answer
    x = 16,780.15

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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.