Home / 20,864.40-28,791.72-11,431.08

Finding the Fourth Proportional to 20,864.40, 28,791.72 and 11,431.08

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Solution

The fourth proportional to 20,864.40, 28,791.72 and 11,431.08 is: 15,774.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,864.40 : 28,791.72 = 11,431.08 : x
  2. Step 2: Convert to fraction form
    20,864.40/28,791.72 = 11,431.08/x
  3. Step 3: Cross multiply
    20,864.40x = 28,791.72 × 11,431.08
  4. Step 4: Simplify right side
    20,864.40x = 329,120,454.66
  5. Step 5: Solve for x
    x = 329,120,454.66/20,864.40
  6. Step 6: Final answer
    x = 15,774.26

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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.