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Finding the Fourth Proportional to 81,915.20, 122,872.80 and 29,326.40

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Solution

The fourth proportional to 81,915.20, 122,872.80 and 29,326.40 is: 43,989.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,915.20 : 122,872.80 = 29,326.40 : x
  2. Step 2: Convert to fraction form
    81,915.20/122,872.80 = 29,326.40/x
  3. Step 3: Cross multiply
    81,915.20x = 122,872.80 × 29,326.40
  4. Step 4: Simplify right side
    81,915.20x = 3,603,416,881.92
  5. Step 5: Solve for x
    x = 3,603,416,881.92/81,915.20
  6. Step 6: Final answer
    x = 43,989.60

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1.5x scale

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.