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Finding the Fourth Proportional to 911.51, 1,366.76 and 391.18

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Solution

The fourth proportional to 911.51, 1,366.76 and 391.18 is: 586.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.51 : 1,366.76 = 391.18 : x
  2. Step 2: Convert to fraction form
    911.51/1,366.76 = 391.18/x
  3. Step 3: Cross multiply
    911.51x = 1,366.76 × 391.18
  4. Step 4: Simplify right side
    911.51x = 534,649.18
  5. Step 5: Solve for x
    x = 534,649.18/911.51
  6. Step 6: Final answer
    x = 586.55

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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.