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Finding the Fourth Proportional to 74,909.80, 112,413.30 and 43,319.80

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Solution

The fourth proportional to 74,909.80, 112,413.30 and 43,319.80 is: 65,007.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,909.80 : 112,413.30 = 43,319.80 : x
  2. Step 2: Convert to fraction form
    74,909.80/112,413.30 = 43,319.80/x
  3. Step 3: Cross multiply
    74,909.80x = 112,413.30 × 43,319.80
  4. Step 4: Simplify right side
    74,909.80x = 4,869,721,673.34
  5. Step 5: Solve for x
    x = 4,869,721,673.34/74,909.80
  6. Step 6: Final answer
    x = 65,007.81

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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.