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Finding the Fourth Proportional to 86,821.80, 130,511.10 and 80,658.60

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Solution

The fourth proportional to 86,821.80, 130,511.10 and 80,658.60 is: 121,246.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,821.80 : 130,511.10 = 80,658.60 : x
  2. Step 2: Convert to fraction form
    86,821.80/130,511.10 = 80,658.60/x
  3. Step 3: Cross multiply
    86,821.80x = 130,511.10 × 80,658.60
  4. Step 4: Simplify right side
    86,821.80x = 10,526,842,610.46
  5. Step 5: Solve for x
    x = 10,526,842,610.46/86,821.80
  6. Step 6: Final answer
    x = 121,246.54

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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.