Home / 20,862.90-28,790.64-11,431.44

Finding the Fourth Proportional to 20,862.90, 28,790.64 and 11,431.44

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Solution

The fourth proportional to 20,862.90, 28,790.64 and 11,431.44 is: 15,775.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.90 : 28,790.64 = 11,431.44 : x
  2. Step 2: Convert to fraction form
    20,862.90/28,790.64 = 11,431.44/x
  3. Step 3: Cross multiply
    20,862.90x = 28,790.64 × 11,431.44
  4. Step 4: Simplify right side
    20,862.90x = 329,118,473.72
  5. Step 5: Solve for x
    x = 329,118,473.72/20,862.90
  6. Step 6: Final answer
    x = 15,775.30

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Half scale
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Double scale
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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.