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Finding the Fourth Proportional to 837.81, 1,155.66 and 660.49

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Solution

The fourth proportional to 837.81, 1,155.66 and 660.49 is: 911.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.81 : 1,155.66 = 660.49 : x
  2. Step 2: Convert to fraction form
    837.81/1,155.66 = 660.49/x
  3. Step 3: Cross multiply
    837.81x = 1,155.66 × 660.49
  4. Step 4: Simplify right side
    837.81x = 763,298.57
  5. Step 5: Solve for x
    x = 763,298.57/837.81
  6. Step 6: Final answer
    x = 911.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.