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Finding the Fourth Proportional to 45,876.68, 68,815.72 and 20,915.72

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Solution

The fourth proportional to 45,876.68, 68,815.72 and 20,915.72 is: 31,373.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,876.68 : 68,815.72 = 20,915.72 : x
  2. Step 2: Convert to fraction form
    45,876.68/68,815.72 = 20,915.72/x
  3. Step 3: Cross multiply
    45,876.68x = 68,815.72 × 20,915.72
  4. Step 4: Simplify right side
    45,876.68x = 1,439,330,331.12
  5. Step 5: Solve for x
    x = 1,439,330,331.12/45,876.68
  6. Step 6: Final answer
    x = 31,373.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.