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Finding the Fourth Proportional to 71,245.65, 98,318.57 and 39,413.87

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Solution

The fourth proportional to 71,245.65, 98,318.57 and 39,413.87 is: 54,390.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,245.65 : 98,318.57 = 39,413.87 : x
  2. Step 2: Convert to fraction form
    71,245.65/98,318.57 = 39,413.87/x
  3. Step 3: Cross multiply
    71,245.65x = 98,318.57 × 39,413.87
  4. Step 4: Simplify right side
    71,245.65x = 3,875,114,647.90
  5. Step 5: Solve for x
    x = 3,875,114,647.90/71,245.65
  6. Step 6: Final answer
    x = 54,390.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.