Home / 20,870.13-28,801.50-11,438.70

Finding the Fourth Proportional to 20,870.13, 28,801.50 and 11,438.70

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Solution

The fourth proportional to 20,870.13, 28,801.50 and 11,438.70 is: 15,785.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.13 : 28,801.50 = 11,438.70 : x
  2. Step 2: Convert to fraction form
    20,870.13/28,801.50 = 11,438.70/x
  3. Step 3: Cross multiply
    20,870.13x = 28,801.50 × 11,438.70
  4. Step 4: Simplify right side
    20,870.13x = 329,451,718.05
  5. Step 5: Solve for x
    x = 329,451,718.05/20,870.13
  6. Step 6: Final answer
    x = 15,785.80

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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.