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Finding the Fourth Proportional to 801.51, 1,202.38 and 411.72

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Solution

The fourth proportional to 801.51, 1,202.38 and 411.72 is: 617.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.51 : 1,202.38 = 411.72 : x
  2. Step 2: Convert to fraction form
    801.51/1,202.38 = 411.72/x
  3. Step 3: Cross multiply
    801.51x = 1,202.38 × 411.72
  4. Step 4: Simplify right side
    801.51x = 495,042.86
  5. Step 5: Solve for x
    x = 495,042.86/801.51
  6. Step 6: Final answer
    x = 617.64

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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.