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Finding the Fourth Proportional to 88,640.80, 132,961.20 and 87,328.60

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Solution

The fourth proportional to 88,640.80, 132,961.20 and 87,328.60 is: 130,992.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,640.80 : 132,961.20 = 87,328.60 : x
  2. Step 2: Convert to fraction form
    88,640.80/132,961.20 = 87,328.60/x
  3. Step 3: Cross multiply
    88,640.80x = 132,961.20 × 87,328.60
  4. Step 4: Simplify right side
    88,640.80x = 11,611,315,450.32
  5. Step 5: Solve for x
    x = 11,611,315,450.32/88,640.80
  6. Step 6: Final answer
    x = 130,992.90

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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.