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Finding the Fourth Proportional to 26,880.80, 40,234.80 and 21,005.60

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Solution

The fourth proportional to 26,880.80, 40,234.80 and 21,005.60 is: 31,440.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,880.80 : 40,234.80 = 21,005.60 : x
  2. Step 2: Convert to fraction form
    26,880.80/40,234.80 = 21,005.60/x
  3. Step 3: Cross multiply
    26,880.80x = 40,234.80 × 21,005.60
  4. Step 4: Simplify right side
    26,880.80x = 845,156,114.88
  5. Step 5: Solve for x
    x = 845,156,114.88/26,880.80
  6. Step 6: Final answer
    x = 31,440.88

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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.