Home / 20,854.40-28,779.40-11,422.72

Finding the Fourth Proportional to 20,854.40, 28,779.40 and 11,422.72

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Solution

The fourth proportional to 20,854.40, 28,779.40 and 11,422.72 is: 15,763.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.40 : 28,779.40 = 11,422.72 : x
  2. Step 2: Convert to fraction form
    20,854.40/28,779.40 = 11,422.72/x
  3. Step 3: Cross multiply
    20,854.40x = 28,779.40 × 11,422.72
  4. Step 4: Simplify right side
    20,854.40x = 328,739,027.97
  5. Step 5: Solve for x
    x = 328,739,027.97/20,854.40
  6. Step 6: Final answer
    x = 15,763.53

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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.