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Finding the Fourth Proportional to 78,230.79, 107,928.93 and 47,991.87

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Solution

The fourth proportional to 78,230.79, 107,928.93 and 47,991.87 is: 66,210.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,230.79 : 107,928.93 = 47,991.87 : x
  2. Step 2: Convert to fraction form
    78,230.79/107,928.93 = 47,991.87/x
  3. Step 3: Cross multiply
    78,230.79x = 107,928.93 × 47,991.87
  4. Step 4: Simplify right side
    78,230.79x = 5,179,711,177.80
  5. Step 5: Solve for x
    x = 5,179,711,177.80/78,230.79
  6. Step 6: Final answer
    x = 66,210.65

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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.