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Finding the Fourth Proportional to 846.55, 1,269.37 and 261.38

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Solution

The fourth proportional to 846.55, 1,269.37 and 261.38 is: 391.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.55 : 1,269.37 = 261.38 : x
  2. Step 2: Convert to fraction form
    846.55/1,269.37 = 261.38/x
  3. Step 3: Cross multiply
    846.55x = 1,269.37 × 261.38
  4. Step 4: Simplify right side
    846.55x = 331,784.29
  5. Step 5: Solve for x
    x = 331,784.29/846.55
  6. Step 6: Final answer
    x = 391.92

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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.