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Finding the Fourth Proportional to 846.80, 1,269.95 and 261.71

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Solution

The fourth proportional to 846.80, 1,269.95 and 261.71 is: 392.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.80 : 1,269.95 = 261.71 : x
  2. Step 2: Convert to fraction form
    846.80/1,269.95 = 261.71/x
  3. Step 3: Cross multiply
    846.80x = 1,269.95 × 261.71
  4. Step 4: Simplify right side
    846.80x = 332,354.35
  5. Step 5: Solve for x
    x = 332,354.35/846.80
  6. Step 6: Final answer
    x = 392.48

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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.