Home / 20,917.50-28,866.18-11,486.70

Finding the Fourth Proportional to 20,917.50, 28,866.18 and 11,486.70

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Solution

The fourth proportional to 20,917.50, 28,866.18 and 11,486.70 is: 15,851.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.50 : 28,866.18 = 11,486.70 : x
  2. Step 2: Convert to fraction form
    20,917.50/28,866.18 = 11,486.70/x
  3. Step 3: Cross multiply
    20,917.50x = 28,866.18 × 11,486.70
  4. Step 4: Simplify right side
    20,917.50x = 331,577,149.81
  5. Step 5: Solve for x
    x = 331,577,149.81/20,917.50
  6. Step 6: Final answer
    x = 15,851.66

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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.