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Finding the Fourth Proportional to 997.93, 1,378.25 and 666.37

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Solution

The fourth proportional to 997.93, 1,378.25 and 666.37 is: 920.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.93 : 1,378.25 = 666.37 : x
  2. Step 2: Convert to fraction form
    997.93/1,378.25 = 666.37/x
  3. Step 3: Cross multiply
    997.93x = 1,378.25 × 666.37
  4. Step 4: Simplify right side
    997.93x = 918,424.45
  5. Step 5: Solve for x
    x = 918,424.45/997.93
  6. Step 6: Final answer
    x = 920.33

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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.