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Finding the Fourth Proportional to 666.15, 919.86 and 636.46

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Solution

The fourth proportional to 666.15, 919.86 and 636.46 is: 878.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.15 : 919.86 = 636.46 : x
  2. Step 2: Convert to fraction form
    666.15/919.86 = 636.46/x
  3. Step 3: Cross multiply
    666.15x = 919.86 × 636.46
  4. Step 4: Simplify right side
    666.15x = 585,454.10
  5. Step 5: Solve for x
    x = 585,454.10/666.15
  6. Step 6: Final answer
    x = 878.86

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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.