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Finding the Fourth Proportional to 91,939,608.80, 137,909,413.20 and 31,357,311.20

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Solution

The fourth proportional to 91,939,608.80, 137,909,413.20 and 31,357,311.20 is: 47,035,966.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,939,608.80 : 137,909,413.20 = 31,357,311.20 : x
  2. Step 2: Convert to fraction form
    91,939,608.80/137,909,413.20 = 31,357,311.20/x
  3. Step 3: Cross multiply
    91,939,608.80x = 137,909,413.20 × 31,357,311.20
  4. Step 4: Simplify right side
    91,939,608.80x = 4,324,468,387,121,787.50
  5. Step 5: Solve for x
    x = 4,324,468,387,121,787.50/91,939,608.80
  6. Step 6: Final answer
    x = 47,035,966.80

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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.