Home / 20,620.16-28,455.90-11,188.80

Finding the Fourth Proportional to 20,620.16, 28,455.90 and 11,188.80

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Solution

The fourth proportional to 20,620.16, 28,455.90 and 11,188.80 is: 15,440.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.16 : 28,455.90 = 11,188.80 : x
  2. Step 2: Convert to fraction form
    20,620.16/28,455.90 = 11,188.80/x
  3. Step 3: Cross multiply
    20,620.16x = 28,455.90 × 11,188.80
  4. Step 4: Simplify right side
    20,620.16x = 318,387,373.92
  5. Step 5: Solve for x
    x = 318,387,373.92/20,620.16
  6. Step 6: Final answer
    x = 15,440.59

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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.