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Finding the Fourth Proportional to 129,694.66, 178,978.63 and 70,078.66

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Solution

The fourth proportional to 129,694.66, 178,978.63 and 70,078.66 is: 96,708.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,694.66 : 178,978.63 = 70,078.66 : x
  2. Step 2: Convert to fraction form
    129,694.66/178,978.63 = 70,078.66/x
  3. Step 3: Cross multiply
    129,694.66x = 178,978.63 × 70,078.66
  4. Step 4: Simplify right side
    129,694.66x = 12,542,582,559.04
  5. Step 5: Solve for x
    x = 12,542,582,559.04/129,694.66
  6. Step 6: Final answer
    x = 96,708.55

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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.