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Finding the Fourth Proportional to 1,016.76, 1,403.38 and 667.92

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Solution

The fourth proportional to 1,016.76, 1,403.38 and 667.92 is: 921.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.76 : 1,403.38 = 667.92 : x
  2. Step 2: Convert to fraction form
    1,016.76/1,403.38 = 667.92/x
  3. Step 3: Cross multiply
    1,016.76x = 1,403.38 × 667.92
  4. Step 4: Simplify right side
    1,016.76x = 937,345.57
  5. Step 5: Solve for x
    x = 937,345.57/1,016.76
  6. Step 6: Final answer
    x = 921.89

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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.