Home / 28,131.15-38,821.10-15,555.90

Finding the Fourth Proportional to 28,131.15, 38,821.10 and 15,555.90

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Solution

The fourth proportional to 28,131.15, 38,821.10 and 15,555.90 is: 21,467.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,131.15 : 38,821.10 = 15,555.90 : x
  2. Step 2: Convert to fraction form
    28,131.15/38,821.10 = 15,555.90/x
  3. Step 3: Cross multiply
    28,131.15x = 38,821.10 × 15,555.90
  4. Step 4: Simplify right side
    28,131.15x = 603,897,149.49
  5. Step 5: Solve for x
    x = 603,897,149.49/28,131.15
  6. Step 6: Final answer
    x = 21,467.20

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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.