Home / 138,949.20-191,749.08-78,539.40

Finding the Fourth Proportional to 138,949.20, 191,749.08 and 78,539.40

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Solution

The fourth proportional to 138,949.20, 191,749.08 and 78,539.40 is: 108,383.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,949.20 : 191,749.08 = 78,539.40 : x
  2. Step 2: Convert to fraction form
    138,949.20/191,749.08 = 78,539.40/x
  3. Step 3: Cross multiply
    138,949.20x = 191,749.08 × 78,539.40
  4. Step 4: Simplify right side
    138,949.20x = 15,059,857,693.75
  5. Step 5: Solve for x
    x = 15,059,857,693.75/138,949.20
  6. Step 6: Final answer
    x = 108,383.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.