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Finding the Fourth Proportional to 129,702.75, 178,989.80 and 70,086.75

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Solution

The fourth proportional to 129,702.75, 178,989.80 and 70,086.75 is: 96,719.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,702.75 : 178,989.80 = 70,086.75 : x
  2. Step 2: Convert to fraction form
    129,702.75/178,989.80 = 70,086.75/x
  3. Step 3: Cross multiply
    129,702.75x = 178,989.80 × 70,086.75
  4. Step 4: Simplify right side
    129,702.75x = 12,544,813,014.72
  5. Step 5: Solve for x
    x = 12,544,813,014.72/129,702.75
  6. Step 6: Final answer
    x = 96,719.72

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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.