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Finding the Fourth Proportional to 129,679.66, 178,972.14 and 75,243.79

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Solution

The fourth proportional to 129,679.66, 178,972.14 and 75,243.79 is: 103,844.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,679.66 : 178,972.14 = 75,243.79 : x
  2. Step 2: Convert to fraction form
    129,679.66/178,972.14 = 75,243.79/x
  3. Step 3: Cross multiply
    129,679.66x = 178,972.14 × 75,243.79
  4. Step 4: Simplify right side
    129,679.66x = 13,466,542,118.01
  5. Step 5: Solve for x
    x = 13,466,542,118.01/129,679.66
  6. Step 6: Final answer
    x = 103,844.67

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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.