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Finding the Fourth Proportional to 801.58, 1,202.10 and 431.17

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Solution

The fourth proportional to 801.58, 1,202.10 and 431.17 is: 646.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.58 : 1,202.10 = 431.17 : x
  2. Step 2: Convert to fraction form
    801.58/1,202.10 = 431.17/x
  3. Step 3: Cross multiply
    801.58x = 1,202.10 × 431.17
  4. Step 4: Simplify right side
    801.58x = 518,309.46
  5. Step 5: Solve for x
    x = 518,309.46/801.58
  6. Step 6: Final answer
    x = 646.61

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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.