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Finding the Fourth Proportional to 138,413.70, 207,620.56 and 79,207.50

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Solution

The fourth proportional to 138,413.70, 207,620.56 and 79,207.50 is: 118,811.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,413.70 : 207,620.56 = 79,207.50 : x
  2. Step 2: Convert to fraction form
    138,413.70/207,620.56 = 79,207.50/x
  3. Step 3: Cross multiply
    138,413.70x = 207,620.56 × 79,207.50
  4. Step 4: Simplify right side
    138,413.70x = 16,445,105,506.20
  5. Step 5: Solve for x
    x = 16,445,105,506.20/138,413.70
  6. Step 6: Final answer
    x = 118,811.26

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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.