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Finding the Fourth Proportional to 843.67, 1,265.71 and 288.38

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Solution

The fourth proportional to 843.67, 1,265.71 and 288.38 is: 432.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.67 : 1,265.71 = 288.38 : x
  2. Step 2: Convert to fraction form
    843.67/1,265.71 = 288.38/x
  3. Step 3: Cross multiply
    843.67x = 1,265.71 × 288.38
  4. Step 4: Simplify right side
    843.67x = 365,005.45
  5. Step 5: Solve for x
    x = 365,005.45/843.67
  6. Step 6: Final answer
    x = 432.64

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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.