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Finding the Fourth Proportional to 666.37, 998.17 and 391.63

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Solution

The fourth proportional to 666.37, 998.17 and 391.63 is: 586.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.37 : 998.17 = 391.63 : x
  2. Step 2: Convert to fraction form
    666.37/998.17 = 391.63/x
  3. Step 3: Cross multiply
    666.37x = 998.17 × 391.63
  4. Step 4: Simplify right side
    666.37x = 390,913.32
  5. Step 5: Solve for x
    x = 390,913.32/666.37
  6. Step 6: Final answer
    x = 586.63

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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.