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Finding the Fourth Proportional to 21,151.60, 31,727.40 and 20,844.40

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Solution

The fourth proportional to 21,151.60, 31,727.40 and 20,844.40 is: 31,266.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,151.60 : 31,727.40 = 20,844.40 : x
  2. Step 2: Convert to fraction form
    21,151.60/31,727.40 = 20,844.40/x
  3. Step 3: Cross multiply
    21,151.60x = 31,727.40 × 20,844.40
  4. Step 4: Simplify right side
    21,151.60x = 661,338,616.56
  5. Step 5: Solve for x
    x = 661,338,616.56/21,151.60
  6. Step 6: Final answer
    x = 31,266.60

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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.