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Finding the Fourth Proportional to 129,611.88, 178,855.29 and 71,466.03

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Solution

The fourth proportional to 129,611.88, 178,855.29 and 71,466.03 is: 98,618.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,611.88 : 178,855.29 = 71,466.03 : x
  2. Step 2: Convert to fraction form
    129,611.88/178,855.29 = 71,466.03/x
  3. Step 3: Cross multiply
    129,611.88x = 178,855.29 × 71,466.03
  4. Step 4: Simplify right side
    129,611.88x = 12,782,077,520.80
  5. Step 5: Solve for x
    x = 12,782,077,520.80/129,611.88
  6. Step 6: Final answer
    x = 98,618.10

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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.