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Finding the Fourth Proportional to 10,812.80, 16,219.20 and 7,119.20

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Solution

The fourth proportional to 10,812.80, 16,219.20 and 7,119.20 is: 10,678.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,812.80 : 16,219.20 = 7,119.20 : x
  2. Step 2: Convert to fraction form
    10,812.80/16,219.20 = 7,119.20/x
  3. Step 3: Cross multiply
    10,812.80x = 16,219.20 × 7,119.20
  4. Step 4: Simplify right side
    10,812.80x = 115,467,728.64
  5. Step 5: Solve for x
    x = 115,467,728.64/10,812.80
  6. Step 6: Final answer
    x = 10,678.80

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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.