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Finding the Fourth Proportional to 666.95, 918.38 and 627.98

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Solution

The fourth proportional to 666.95, 918.38 and 627.98 is: 864.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.95 : 918.38 = 627.98 : x
  2. Step 2: Convert to fraction form
    666.95/918.38 = 627.98/x
  3. Step 3: Cross multiply
    666.95x = 918.38 × 627.98
  4. Step 4: Simplify right side
    666.95x = 576,716.54
  5. Step 5: Solve for x
    x = 576,716.54/666.95
  6. Step 6: Final answer
    x = 864.71

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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.