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Finding the Fourth Proportional to 278,685.39, 417,921.09 and 118,659.87

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Solution

The fourth proportional to 278,685.39, 417,921.09 and 118,659.87 is: 177,944.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,685.39 : 417,921.09 = 118,659.87 : x
  2. Step 2: Convert to fraction form
    278,685.39/417,921.09 = 118,659.87/x
  3. Step 3: Cross multiply
    278,685.39x = 417,921.09 × 118,659.87
  4. Step 4: Simplify right side
    278,685.39x = 49,590,462,209.66
  5. Step 5: Solve for x
    x = 49,590,462,209.66/278,685.39
  6. Step 6: Final answer
    x = 177,944.25

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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.