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Finding the Fourth Proportional to 666.35, 998.50 and 392.29

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Solution

The fourth proportional to 666.35, 998.50 and 392.29 is: 587.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.35 : 998.50 = 392.29 : x
  2. Step 2: Convert to fraction form
    666.35/998.50 = 392.29/x
  3. Step 3: Cross multiply
    666.35x = 998.50 × 392.29
  4. Step 4: Simplify right side
    666.35x = 391,705.54
  5. Step 5: Solve for x
    x = 391,705.54/666.35
  6. Step 6: Final answer
    x = 587.84

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Why These Related Problems?

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