Home / 20,870.98-28,840.15-15,195.88

Finding the Fourth Proportional to 20,870.98, 28,840.15 and 15,195.88

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Solution

The fourth proportional to 20,870.98, 28,840.15 and 15,195.88 is: 20,998.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.98 : 28,840.15 = 15,195.88 : x
  2. Step 2: Convert to fraction form
    20,870.98/28,840.15 = 15,195.88/x
  3. Step 3: Cross multiply
    20,870.98x = 28,840.15 × 15,195.88
  4. Step 4: Simplify right side
    20,870.98x = 438,251,458.58
  5. Step 5: Solve for x
    x = 438,251,458.58/20,870.98
  6. Step 6: Final answer
    x = 20,998.13

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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.