Home / 28,638.12-39,520.82-15,891.35

Finding the Fourth Proportional to 28,638.12, 39,520.82 and 15,891.35

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Solution

The fourth proportional to 28,638.12, 39,520.82 and 15,891.35 is: 21,930.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.12 : 39,520.82 = 15,891.35 : x
  2. Step 2: Convert to fraction form
    28,638.12/39,520.82 = 15,891.35/x
  3. Step 3: Cross multiply
    28,638.12x = 39,520.82 × 15,891.35
  4. Step 4: Simplify right side
    28,638.12x = 628,039,123.83
  5. Step 5: Solve for x
    x = 628,039,123.83/28,638.12
  6. Step 6: Final answer
    x = 21,930.18

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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.