Home / 20,862.81-28,790.79-11,431.71

Finding the Fourth Proportional to 20,862.81, 28,790.79 and 11,431.71

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Solution

The fourth proportional to 20,862.81, 28,790.79 and 11,431.71 is: 15,775.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.81 : 28,790.79 = 11,431.71 : x
  2. Step 2: Convert to fraction form
    20,862.81/28,790.79 = 11,431.71/x
  3. Step 3: Cross multiply
    20,862.81x = 28,790.79 × 11,431.71
  4. Step 4: Simplify right side
    20,862.81x = 329,127,961.95
  5. Step 5: Solve for x
    x = 329,127,961.95/20,862.81
  6. Step 6: Final answer
    x = 15,775.82

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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.