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Finding the Fourth Proportional to 661.10, 985.62 and 644.27

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Solution

The fourth proportional to 661.10, 985.62 and 644.27 is: 960.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.10 : 985.62 = 644.27 : x
  2. Step 2: Convert to fraction form
    661.10/985.62 = 644.27/x
  3. Step 3: Cross multiply
    661.10x = 985.62 × 644.27
  4. Step 4: Simplify right side
    661.10x = 635,005.40
  5. Step 5: Solve for x
    x = 635,005.40/661.10
  6. Step 6: Final answer
    x = 960.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.