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Finding the Fourth Proportional to 843.80, 1,265.90 and 288.50

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Solution

The fourth proportional to 843.80, 1,265.90 and 288.50 is: 432.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.80 : 1,265.90 = 288.50 : x
  2. Step 2: Convert to fraction form
    843.80/1,265.90 = 288.50/x
  3. Step 3: Cross multiply
    843.80x = 1,265.90 × 288.50
  4. Step 4: Simplify right side
    843.80x = 365,212.15
  5. Step 5: Solve for x
    x = 365,212.15/843.80
  6. Step 6: Final answer
    x = 432.82

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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.