Home / 20,888.20-28,815.78-12,503.08

Finding the Fourth Proportional to 20,888.20, 28,815.78 and 12,503.08

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Solution

The fourth proportional to 20,888.20, 28,815.78 and 12,503.08 is: 17,248.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.20 : 28,815.78 = 12,503.08 : x
  2. Step 2: Convert to fraction form
    20,888.20/28,815.78 = 12,503.08/x
  3. Step 3: Cross multiply
    20,888.20x = 28,815.78 × 12,503.08
  4. Step 4: Simplify right side
    20,888.20x = 360,286,002.60
  5. Step 5: Solve for x
    x = 360,286,002.60/20,888.20
  6. Step 6: Final answer
    x = 17,248.30

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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.