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Finding the Fourth Proportional to 20,620.15, 28,455.71 and 11,188.71

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Solution

The fourth proportional to 20,620.15, 28,455.71 and 11,188.71 is: 15,440.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.15 : 28,455.71 = 11,188.71 : x
  2. Step 2: Convert to fraction form
    20,620.15/28,455.71 = 11,188.71/x
  3. Step 3: Cross multiply
    20,620.15x = 28,455.71 × 11,188.71
  4. Step 4: Simplify right side
    20,620.15x = 318,382,687.03
  5. Step 5: Solve for x
    x = 318,382,687.03/20,620.15
  6. Step 6: Final answer
    x = 15,440.37

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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.