Home / 20,871.54-28,830.33-15,557.13

Finding the Fourth Proportional to 20,871.54, 28,830.33 and 15,557.13

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Solution

The fourth proportional to 20,871.54, 28,830.33 and 15,557.13 is: 21,489.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.54 : 28,830.33 = 15,557.13 : x
  2. Step 2: Convert to fraction form
    20,871.54/28,830.33 = 15,557.13/x
  3. Step 3: Cross multiply
    20,871.54x = 28,830.33 × 15,557.13
  4. Step 4: Simplify right side
    20,871.54x = 448,517,191.75
  5. Step 5: Solve for x
    x = 448,517,191.75/20,871.54
  6. Step 6: Final answer
    x = 21,489.42

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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.