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Finding the Fourth Proportional to 221,121.80, 331,317.90 and 127,464.20

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Solution

The fourth proportional to 221,121.80, 331,317.90 and 127,464.20 is: 190,986.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,121.80 : 331,317.90 = 127,464.20 : x
  2. Step 2: Convert to fraction form
    221,121.80/331,317.90 = 127,464.20/x
  3. Step 3: Cross multiply
    221,121.80x = 331,317.90 × 127,464.20
  4. Step 4: Simplify right side
    221,121.80x = 42,231,171,069.18
  5. Step 5: Solve for x
    x = 42,231,171,069.18/221,121.80
  6. Step 6: Final answer
    x = 190,986.01

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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.