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Finding the Fourth Proportional to 644.55, 968.30 and 371.31

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Solution

The fourth proportional to 644.55, 968.30 and 371.31 is: 557.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.55 : 968.30 = 371.31 : x
  2. Step 2: Convert to fraction form
    644.55/968.30 = 371.31/x
  3. Step 3: Cross multiply
    644.55x = 968.30 × 371.31
  4. Step 4: Simplify right side
    644.55x = 359,539.47
  5. Step 5: Solve for x
    x = 359,539.47/644.55
  6. Step 6: Final answer
    x = 557.81

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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.