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Finding the Fourth Proportional to 20,806.60, 31,145.10 and 20,158.60

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Solution

The fourth proportional to 20,806.60, 31,145.10 and 20,158.60 is: 30,175.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.60 : 31,145.10 = 20,158.60 : x
  2. Step 2: Convert to fraction form
    20,806.60/31,145.10 = 20,158.60/x
  3. Step 3: Cross multiply
    20,806.60x = 31,145.10 × 20,158.60
  4. Step 4: Simplify right side
    20,806.60x = 627,841,612.86
  5. Step 5: Solve for x
    x = 627,841,612.86/20,806.60
  6. Step 6: Final answer
    x = 30,175.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.