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Finding the Fourth Proportional to 81,866.41, 122,832.42 and 25,715.20

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Solution

The fourth proportional to 81,866.41, 122,832.42 and 25,715.20 is: 38,583.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,866.41 : 122,832.42 = 25,715.20 : x
  2. Step 2: Convert to fraction form
    81,866.41/122,832.42 = 25,715.20/x
  3. Step 3: Cross multiply
    81,866.41x = 122,832.42 × 25,715.20
  4. Step 4: Simplify right side
    81,866.41x = 3,158,660,246.78
  5. Step 5: Solve for x
    x = 3,158,660,246.78/81,866.41
  6. Step 6: Final answer
    x = 38,583.10

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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.