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Finding the Fourth Proportional to 100,869.20, 151,044.60 and 74,430.80

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Solution

The fourth proportional to 100,869.20, 151,044.60 and 74,430.80 is: 111,454.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,869.20 : 151,044.60 = 74,430.80 : x
  2. Step 2: Convert to fraction form
    100,869.20/151,044.60 = 74,430.80/x
  3. Step 3: Cross multiply
    100,869.20x = 151,044.60 × 74,430.80
  4. Step 4: Simplify right side
    100,869.20x = 11,242,370,413.68
  5. Step 5: Solve for x
    x = 11,242,370,413.68/100,869.20
  6. Step 6: Final answer
    x = 111,454.94

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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.