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Finding the Fourth Proportional to 113,620.40, 170,430.60 and 80,442.80

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Solution

The fourth proportional to 113,620.40, 170,430.60 and 80,442.80 is: 120,664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,620.40 : 170,430.60 = 80,442.80 : x
  2. Step 2: Convert to fraction form
    113,620.40/170,430.60 = 80,442.80/x
  3. Step 3: Cross multiply
    113,620.40x = 170,430.60 × 80,442.80
  4. Step 4: Simplify right side
    113,620.40x = 13,709,914,669.68
  5. Step 5: Solve for x
    x = 13,709,914,669.68/113,620.40
  6. Step 6: Final answer
    x = 120,664.20

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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.