Home / 20,870.64-28,801.17-11,439.21

Finding the Fourth Proportional to 20,870.64, 28,801.17 and 11,439.21

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Solution

The fourth proportional to 20,870.64, 28,801.17 and 11,439.21 is: 15,785.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.64 : 28,801.17 = 11,439.21 : x
  2. Step 2: Convert to fraction form
    20,870.64/28,801.17 = 11,439.21/x
  3. Step 3: Cross multiply
    20,870.64x = 28,801.17 × 11,439.21
  4. Step 4: Simplify right side
    20,870.64x = 329,462,631.88
  5. Step 5: Solve for x
    x = 329,462,631.88/20,870.64
  6. Step 6: Final answer
    x = 15,785.94

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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.