Home / 20,870.32-28,801.56-11,439.76

Finding the Fourth Proportional to 20,870.32, 28,801.56 and 11,439.76

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Solution

The fourth proportional to 20,870.32, 28,801.56 and 11,439.76 is: 15,787.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.32 : 28,801.56 = 11,439.76 : x
  2. Step 2: Convert to fraction form
    20,870.32/28,801.56 = 11,439.76/x
  3. Step 3: Cross multiply
    20,870.32x = 28,801.56 × 11,439.76
  4. Step 4: Simplify right side
    20,870.32x = 329,482,934.03
  5. Step 5: Solve for x
    x = 329,482,934.03/20,870.32
  6. Step 6: Final answer
    x = 15,787.15

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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.