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Finding the Fourth Proportional to 666.67, 999.86 and 255.66

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Solution

The fourth proportional to 666.67, 999.86 and 255.66 is: 383.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.67 : 999.86 = 255.66 : x
  2. Step 2: Convert to fraction form
    666.67/999.86 = 255.66/x
  3. Step 3: Cross multiply
    666.67x = 999.86 × 255.66
  4. Step 4: Simplify right side
    666.67x = 255,624.21
  5. Step 5: Solve for x
    x = 255,624.21/666.67
  6. Step 6: Final answer
    x = 383.43

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.