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Finding the Fourth Proportional to 1,227.11, 1,693.38 and 667.57

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Solution

The fourth proportional to 1,227.11, 1,693.38 and 667.57 is: 921.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.11 : 1,693.38 = 667.57 : x
  2. Step 2: Convert to fraction form
    1,227.11/1,693.38 = 667.57/x
  3. Step 3: Cross multiply
    1,227.11x = 1,693.38 × 667.57
  4. Step 4: Simplify right side
    1,227.11x = 1,130,449.69
  5. Step 5: Solve for x
    x = 1,130,449.69/1,227.11
  6. Step 6: Final answer
    x = 921.23

Related Problems

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Half scale
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Double scale
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1.5x scale

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.