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Finding the Fourth Proportional to 996.65, 1,375.95 and 666.17

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Solution

The fourth proportional to 996.65, 1,375.95 and 666.17 is: 919.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.65 : 1,375.95 = 666.17 : x
  2. Step 2: Convert to fraction form
    996.65/1,375.95 = 666.17/x
  3. Step 3: Cross multiply
    996.65x = 1,375.95 × 666.17
  4. Step 4: Simplify right side
    996.65x = 916,616.61
  5. Step 5: Solve for x
    x = 916,616.61/996.65
  6. Step 6: Final answer
    x = 919.70

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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.