Home / 20,870.32-28,801.15-11,439.22

Finding the Fourth Proportional to 20,870.32, 28,801.15 and 11,439.22

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Solution

The fourth proportional to 20,870.32, 28,801.15 and 11,439.22 is: 15,786.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.32 : 28,801.15 = 11,439.22 : x
  2. Step 2: Convert to fraction form
    20,870.32/28,801.15 = 11,439.22/x
  3. Step 3: Cross multiply
    20,870.32x = 28,801.15 × 11,439.22
  4. Step 4: Simplify right side
    20,870.32x = 329,462,691.10
  5. Step 5: Solve for x
    x = 329,462,691.10/20,870.32
  6. Step 6: Final answer
    x = 15,786.18

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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.