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Finding the Fourth Proportional to 81,016.28, 111,808 and 45,213.20

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Solution

The fourth proportional to 81,016.28, 111,808 and 45,213.20 is: 62,397.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,016.28 : 111,808 = 45,213.20 : x
  2. Step 2: Convert to fraction form
    81,016.28/111,808 = 45,213.20/x
  3. Step 3: Cross multiply
    81,016.28x = 111,808 × 45,213.20
  4. Step 4: Simplify right side
    81,016.28x = 5,055,197,465.60
  5. Step 5: Solve for x
    x = 5,055,197,465.60/81,016.28
  6. Step 6: Final answer
    x = 62,397.30

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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.