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Finding the Fourth Proportional to 644.46, 889.38 and 395.70

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Solution

The fourth proportional to 644.46, 889.38 and 395.70 is: 546.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.46 : 889.38 = 395.70 : x
  2. Step 2: Convert to fraction form
    644.46/889.38 = 395.70/x
  3. Step 3: Cross multiply
    644.46x = 889.38 × 395.70
  4. Step 4: Simplify right side
    644.46x = 351,927.67
  5. Step 5: Solve for x
    x = 351,927.67/644.46
  6. Step 6: Final answer
    x = 546.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.