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Finding the Fourth Proportional to 221,218.20, 331,851.60 and 81,007.20

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Solution

The fourth proportional to 221,218.20, 331,851.60 and 81,007.20 is: 121,519.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,218.20 : 331,851.60 = 81,007.20 : x
  2. Step 2: Convert to fraction form
    221,218.20/331,851.60 = 81,007.20/x
  3. Step 3: Cross multiply
    221,218.20x = 331,851.60 × 81,007.20
  4. Step 4: Simplify right side
    221,218.20x = 26,882,368,931.52
  5. Step 5: Solve for x
    x = 26,882,368,931.52/221,218.20
  6. Step 6: Final answer
    x = 121,519.70

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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.