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Finding the Fourth Proportional to 74,979.67, 112,413.95 and 45,390.51

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Solution

The fourth proportional to 74,979.67, 112,413.95 and 45,390.51 is: 68,052.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,979.67 : 112,413.95 = 45,390.51 : x
  2. Step 2: Convert to fraction form
    74,979.67/112,413.95 = 45,390.51/x
  3. Step 3: Cross multiply
    74,979.67x = 112,413.95 × 45,390.51
  4. Step 4: Simplify right side
    74,979.67x = 5,102,526,521.61
  5. Step 5: Solve for x
    x = 5,102,526,521.61/74,979.67
  6. Step 6: Final answer
    x = 68,052.13

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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.