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Finding the Fourth Proportional to 129,698.72, 178,975.68 and 73,108.88

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Solution

The fourth proportional to 129,698.72, 178,975.68 and 73,108.88 is: 100,885.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,698.72 : 178,975.68 = 73,108.88 : x
  2. Step 2: Convert to fraction form
    129,698.72/178,975.68 = 73,108.88/x
  3. Step 3: Cross multiply
    129,698.72x = 178,975.68 × 73,108.88
  4. Step 4: Simplify right side
    129,698.72x = 13,084,711,512.04
  5. Step 5: Solve for x
    x = 13,084,711,512.04/129,698.72
  6. Step 6: Final answer
    x = 100,885.43

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1.5x scale

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.