Home / 21,379.22-29,505.14-12,426.15

Finding the Fourth Proportional to 21,379.22, 29,505.14 and 12,426.15

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Solution

The fourth proportional to 21,379.22, 29,505.14 and 12,426.15 is: 17,149.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.22 : 29,505.14 = 12,426.15 : x
  2. Step 2: Convert to fraction form
    21,379.22/29,505.14 = 12,426.15/x
  3. Step 3: Cross multiply
    21,379.22x = 29,505.14 × 12,426.15
  4. Step 4: Simplify right side
    21,379.22x = 366,635,148.12
  5. Step 5: Solve for x
    x = 366,635,148.12/21,379.22
  6. Step 6: Final answer
    x = 17,149.14

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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.