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Finding the Fourth Proportional to 129,657.39, 178,976.40 and 87,240.51

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Solution

The fourth proportional to 129,657.39, 178,976.40 and 87,240.51 is: 120,425.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,657.39 : 178,976.40 = 87,240.51 : x
  2. Step 2: Convert to fraction form
    129,657.39/178,976.40 = 87,240.51/x
  3. Step 3: Cross multiply
    129,657.39x = 178,976.40 × 87,240.51
  4. Step 4: Simplify right side
    129,657.39x = 15,613,992,413.96
  5. Step 5: Solve for x
    x = 15,613,992,413.96/129,657.39
  6. Step 6: Final answer
    x = 120,425.01

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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.