Home / 20,389.76-28,140-11,439.68

Finding the Fourth Proportional to 20,389.76, 28,140 and 11,439.68

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Solution

The fourth proportional to 20,389.76, 28,140 and 11,439.68 is: 15,787.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.76 : 28,140 = 11,439.68 : x
  2. Step 2: Convert to fraction form
    20,389.76/28,140 = 11,439.68/x
  3. Step 3: Cross multiply
    20,389.76x = 28,140 × 11,439.68
  4. Step 4: Simplify right side
    20,389.76x = 321,912,595.20
  5. Step 5: Solve for x
    x = 321,912,595.20/20,389.76
  6. Step 6: Final answer
    x = 15,787.95

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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.