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Finding the Fourth Proportional to 656.78, 985.17 and 331.93

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Solution

The fourth proportional to 656.78, 985.17 and 331.93 is: 497.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.78 : 985.17 = 331.93 : x
  2. Step 2: Convert to fraction form
    656.78/985.17 = 331.93/x
  3. Step 3: Cross multiply
    656.78x = 985.17 × 331.93
  4. Step 4: Simplify right side
    656.78x = 327,007.48
  5. Step 5: Solve for x
    x = 327,007.48/656.78
  6. Step 6: Final answer
    x = 497.90

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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.