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Finding the Fourth Proportional to 881.11, 1,320.79 and 418.95

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Solution

The fourth proportional to 881.11, 1,320.79 and 418.95 is: 628.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.11 : 1,320.79 = 418.95 : x
  2. Step 2: Convert to fraction form
    881.11/1,320.79 = 418.95/x
  3. Step 3: Cross multiply
    881.11x = 1,320.79 × 418.95
  4. Step 4: Simplify right side
    881.11x = 553,344.97
  5. Step 5: Solve for x
    x = 553,344.97/881.11
  6. Step 6: Final answer
    x = 628.01

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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.