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Finding the Fourth Proportional to 78,971.04, 118,413.17 and 38,901.86

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Solution

The fourth proportional to 78,971.04, 118,413.17 and 38,901.86 is: 58,331.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,971.04 : 118,413.17 = 38,901.86 : x
  2. Step 2: Convert to fraction form
    78,971.04/118,413.17 = 38,901.86/x
  3. Step 3: Cross multiply
    78,971.04x = 118,413.17 × 38,901.86
  4. Step 4: Simplify right side
    78,971.04x = 4,606,492,066.68
  5. Step 5: Solve for x
    x = 4,606,492,066.68/78,971.04
  6. Step 6: Final answer
    x = 58,331.41

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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.