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Finding the Fourth Proportional to 81,605.20, 122,407.80 and 81,605.20

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Solution

The fourth proportional to 81,605.20, 122,407.80 and 81,605.20 is: 122,407.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,605.20 : 122,407.80 = 81,605.20 : x
  2. Step 2: Convert to fraction form
    81,605.20/122,407.80 = 81,605.20/x
  3. Step 3: Cross multiply
    81,605.20x = 122,407.80 × 81,605.20
  4. Step 4: Simplify right side
    81,605.20x = 9,989,113,000.56
  5. Step 5: Solve for x
    x = 9,989,113,000.56/81,605.20
  6. Step 6: Final answer
    x = 122,407.80

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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.