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Finding the Fourth Proportional to 74,979.81, 112,413.69 and 45,390.51

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Solution

The fourth proportional to 74,979.81, 112,413.69 and 45,390.51 is: 68,051.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,979.81 : 112,413.69 = 45,390.51 : x
  2. Step 2: Convert to fraction form
    74,979.81/112,413.69 = 45,390.51/x
  3. Step 3: Cross multiply
    74,979.81x = 112,413.69 × 45,390.51
  4. Step 4: Simplify right side
    74,979.81x = 5,102,514,720.08
  5. Step 5: Solve for x
    x = 5,102,514,720.08/74,979.81
  6. Step 6: Final answer
    x = 68,051.85

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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.