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Finding the Fourth Proportional to 42,380.80, 63,571.20 and 11,219.20

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Solution

The fourth proportional to 42,380.80, 63,571.20 and 11,219.20 is: 16,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,380.80 : 63,571.20 = 11,219.20 : x
  2. Step 2: Convert to fraction form
    42,380.80/63,571.20 = 11,219.20/x
  3. Step 3: Cross multiply
    42,380.80x = 63,571.20 × 11,219.20
  4. Step 4: Simplify right side
    42,380.80x = 713,218,007.04
  5. Step 5: Solve for x
    x = 713,218,007.04/42,380.80
  6. Step 6: Final answer
    x = 16,828.80

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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.