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Finding the Fourth Proportional to 644.56, 959.22 and 621.52

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Solution

The fourth proportional to 644.56, 959.22 and 621.52 is: 924.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.56 : 959.22 = 621.52 : x
  2. Step 2: Convert to fraction form
    644.56/959.22 = 621.52/x
  3. Step 3: Cross multiply
    644.56x = 959.22 × 621.52
  4. Step 4: Simplify right side
    644.56x = 596,174.41
  5. Step 5: Solve for x
    x = 596,174.41/644.56
  6. Step 6: Final answer
    x = 924.93

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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.