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Finding the Fourth Proportional to 911.19, 1,366.78 and 261.93

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Solution

The fourth proportional to 911.19, 1,366.78 and 261.93 is: 392.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.19 : 1,366.78 = 261.93 : x
  2. Step 2: Convert to fraction form
    911.19/1,366.78 = 261.93/x
  3. Step 3: Cross multiply
    911.19x = 1,366.78 × 261.93
  4. Step 4: Simplify right side
    911.19x = 358,000.69
  5. Step 5: Solve for x
    x = 358,000.69/911.19
  6. Step 6: Final answer
    x = 392.89

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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.