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Finding the Fourth Proportional to 98,390.80, 147,413.40 and 80,765.20

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Solution

The fourth proportional to 98,390.80, 147,413.40 and 80,765.20 is: 121,005.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,390.80 : 147,413.40 = 80,765.20 : x
  2. Step 2: Convert to fraction form
    98,390.80/147,413.40 = 80,765.20/x
  3. Step 3: Cross multiply
    98,390.80x = 147,413.40 × 80,765.20
  4. Step 4: Simplify right side
    98,390.80x = 11,905,872,733.68
  5. Step 5: Solve for x
    x = 11,905,872,733.68/98,390.80
  6. Step 6: Final answer
    x = 121,005.96

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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.