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Finding the Fourth Proportional to 801.79, 1,106.21 and 447.65

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Solution

The fourth proportional to 801.79, 1,106.21 and 447.65 is: 617.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.79 : 1,106.21 = 447.65 : x
  2. Step 2: Convert to fraction form
    801.79/1,106.21 = 447.65/x
  3. Step 3: Cross multiply
    801.79x = 1,106.21 × 447.65
  4. Step 4: Simplify right side
    801.79x = 495,191.29
  5. Step 5: Solve for x
    x = 495,191.29/801.79
  6. Step 6: Final answer
    x = 617.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.