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Finding the Fourth Proportional to 911.65, 1,358.82 and 881.65

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Solution

The fourth proportional to 911.65, 1,358.82 and 881.65 is: 1,314.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.65 : 1,358.82 = 881.65 : x
  2. Step 2: Convert to fraction form
    911.65/1,358.82 = 881.65/x
  3. Step 3: Cross multiply
    911.65x = 1,358.82 × 881.65
  4. Step 4: Simplify right side
    911.65x = 1,198,003.65
  5. Step 5: Solve for x
    x = 1,198,003.65/911.65
  6. Step 6: Final answer
    x = 1,314.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.