Home / 20,885.08-28,859.57-15,209.95

Finding the Fourth Proportional to 20,885.08, 28,859.57 and 15,209.95

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Solution

The fourth proportional to 20,885.08, 28,859.57 and 15,209.95 is: 21,017.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.08 : 28,859.57 = 15,209.95 : x
  2. Step 2: Convert to fraction form
    20,885.08/28,859.57 = 15,209.95/x
  3. Step 3: Cross multiply
    20,885.08x = 28,859.57 × 15,209.95
  4. Step 4: Simplify right side
    20,885.08x = 438,952,540.67
  5. Step 5: Solve for x
    x = 438,952,540.67/20,885.08
  6. Step 6: Final answer
    x = 21,017.52

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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.