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Finding the Fourth Proportional to 129,685.69, 179,010.90 and 75,988.09

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Solution

The fourth proportional to 129,685.69, 179,010.90 and 75,988.09 is: 104,889.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,685.69 : 179,010.90 = 75,988.09 : x
  2. Step 2: Convert to fraction form
    129,685.69/179,010.90 = 75,988.09/x
  3. Step 3: Cross multiply
    129,685.69x = 179,010.90 × 75,988.09
  4. Step 4: Simplify right side
    129,685.69x = 13,602,696,380.18
  5. Step 5: Solve for x
    x = 13,602,696,380.18/129,685.69
  6. Step 6: Final answer
    x = 104,889.73

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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.