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Finding the Fourth Proportional to 129,649, 178,915.78 and 70,033

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Solution

The fourth proportional to 129,649, 178,915.78 and 70,033 is: 96,645.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,649 : 178,915.78 = 70,033 : x
  2. Step 2: Convert to fraction form
    129,649/178,915.78 = 70,033/x
  3. Step 3: Cross multiply
    129,649x = 178,915.78 × 70,033
  4. Step 4: Simplify right side
    129,649x = 12,530,008,820.74
  5. Step 5: Solve for x
    x = 12,530,008,820.74/129,649
  6. Step 6: Final answer
    x = 96,645.63

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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.