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Finding the Fourth Proportional to 138,561.60, 207,842.40 and 121,454.40

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Solution

The fourth proportional to 138,561.60, 207,842.40 and 121,454.40 is: 182,181.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,561.60 : 207,842.40 = 121,454.40 : x
  2. Step 2: Convert to fraction form
    138,561.60/207,842.40 = 121,454.40/x
  3. Step 3: Cross multiply
    138,561.60x = 207,842.40 × 121,454.40
  4. Step 4: Simplify right side
    138,561.60x = 25,243,373,986.56
  5. Step 5: Solve for x
    x = 25,243,373,986.56/138,561.60
  6. Step 6: Final answer
    x = 182,181.60

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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.