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Finding the Fourth Proportional to 10,880.80, 16,321.20 and 7,187.20

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Solution

The fourth proportional to 10,880.80, 16,321.20 and 7,187.20 is: 10,780.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,880.80 : 16,321.20 = 7,187.20 : x
  2. Step 2: Convert to fraction form
    10,880.80/16,321.20 = 7,187.20/x
  3. Step 3: Cross multiply
    10,880.80x = 16,321.20 × 7,187.20
  4. Step 4: Simplify right side
    10,880.80x = 117,303,728.64
  5. Step 5: Solve for x
    x = 117,303,728.64/10,880.80
  6. Step 6: Final answer
    x = 10,780.80

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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.