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Finding the Fourth Proportional to 78,619.65, 117,900.92 and 34,235.70

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Solution

The fourth proportional to 78,619.65, 117,900.92 and 34,235.70 is: 51,341.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,619.65 : 117,900.92 = 34,235.70 : x
  2. Step 2: Convert to fraction form
    78,619.65/117,900.92 = 34,235.70/x
  3. Step 3: Cross multiply
    78,619.65x = 117,900.92 × 34,235.70
  4. Step 4: Simplify right side
    78,619.65x = 4,036,419,766.16
  5. Step 5: Solve for x
    x = 4,036,419,766.16/78,619.65
  6. Step 6: Final answer
    x = 51,341.11

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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.