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Finding the Fourth Proportional to 816.14, 1,124.38 and 667.91

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Solution

The fourth proportional to 816.14, 1,124.38 and 667.91 is: 920.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.14 : 1,124.38 = 667.91 : x
  2. Step 2: Convert to fraction form
    816.14/1,124.38 = 667.91/x
  3. Step 3: Cross multiply
    816.14x = 1,124.38 × 667.91
  4. Step 4: Simplify right side
    816.14x = 750,984.65
  5. Step 5: Solve for x
    x = 750,984.65/816.14
  6. Step 6: Final answer
    x = 920.17

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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.