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Finding the Fourth Proportional to 99,672.80, 149,509.20 and 68,413.28

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Solution

The fourth proportional to 99,672.80, 149,509.20 and 68,413.28 is: 102,619.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,672.80 : 149,509.20 = 68,413.28 : x
  2. Step 2: Convert to fraction form
    99,672.80/149,509.20 = 68,413.28/x
  3. Step 3: Cross multiply
    99,672.80x = 149,509.20 × 68,413.28
  4. Step 4: Simplify right side
    99,672.80x = 10,228,414,762.18
  5. Step 5: Solve for x
    x = 10,228,414,762.18/99,672.80
  6. Step 6: Final answer
    x = 102,619.92

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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.