Home / 20,917.22-28,865.80-11,486.40

Finding the Fourth Proportional to 20,917.22, 28,865.80 and 11,486.40

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Solution

The fourth proportional to 20,917.22, 28,865.80 and 11,486.40 is: 15,851.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.22 : 28,865.80 = 11,486.40 : x
  2. Step 2: Convert to fraction form
    20,917.22/28,865.80 = 11,486.40/x
  3. Step 3: Cross multiply
    20,917.22x = 28,865.80 × 11,486.40
  4. Step 4: Simplify right side
    20,917.22x = 331,564,125.12
  5. Step 5: Solve for x
    x = 331,564,125.12/20,917.22
  6. Step 6: Final answer
    x = 15,851.25

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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.