Home / 21,645.75-29,868.15-13,149.66

Finding the Fourth Proportional to 21,645.75, 29,868.15 and 13,149.66

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Solution

The fourth proportional to 21,645.75, 29,868.15 and 13,149.66 is: 18,144.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,645.75 : 29,868.15 = 13,149.66 : x
  2. Step 2: Convert to fraction form
    21,645.75/29,868.15 = 13,149.66/x
  3. Step 3: Cross multiply
    21,645.75x = 29,868.15 × 13,149.66
  4. Step 4: Simplify right side
    21,645.75x = 392,756,017.33
  5. Step 5: Solve for x
    x = 392,756,017.33/21,645.75
  6. Step 6: Final answer
    x = 18,144.72

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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.