Home / 20,901.71-28,821.98-15,808.79

Finding the Fourth Proportional to 20,901.71, 28,821.98 and 15,808.79

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Solution

The fourth proportional to 20,901.71, 28,821.98 and 15,808.79 is: 21,799.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,901.71 : 28,821.98 = 15,808.79 : x
  2. Step 2: Convert to fraction form
    20,901.71/28,821.98 = 15,808.79/x
  3. Step 3: Cross multiply
    20,901.71x = 28,821.98 × 15,808.79
  4. Step 4: Simplify right side
    20,901.71x = 455,640,524.62
  5. Step 5: Solve for x
    x = 455,640,524.62/20,901.71
  6. Step 6: Final answer
    x = 21,799.20

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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.