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Finding the Fourth Proportional to 997.34, 1,376.80 and 665.98

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Solution

The fourth proportional to 997.34, 1,376.80 and 665.98 is: 919.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.34 : 1,376.80 = 665.98 : x
  2. Step 2: Convert to fraction form
    997.34/1,376.80 = 665.98/x
  3. Step 3: Cross multiply
    997.34x = 1,376.80 × 665.98
  4. Step 4: Simplify right side
    997.34x = 916,921.26
  5. Step 5: Solve for x
    x = 916,921.26/997.34
  6. Step 6: Final answer
    x = 919.37

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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.