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Finding the Fourth Proportional to 129,712.39, 178,975.88 and 78,751.95

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Solution

The fourth proportional to 129,712.39, 178,975.88 and 78,751.95 is: 108,661.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,712.39 : 178,975.88 = 78,751.95 : x
  2. Step 2: Convert to fraction form
    129,712.39/178,975.88 = 78,751.95/x
  3. Step 3: Cross multiply
    129,712.39x = 178,975.88 × 78,751.95
  4. Step 4: Simplify right side
    129,712.39x = 14,094,698,783.37
  5. Step 5: Solve for x
    x = 14,094,698,783.37/129,712.39
  6. Step 6: Final answer
    x = 108,661.16

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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.