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Finding the Fourth Proportional to 644.75, 889.98 and 402.41

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Solution

The fourth proportional to 644.75, 889.98 and 402.41 is: 555.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.75 : 889.98 = 402.41 : x
  2. Step 2: Convert to fraction form
    644.75/889.98 = 402.41/x
  3. Step 3: Cross multiply
    644.75x = 889.98 × 402.41
  4. Step 4: Simplify right side
    644.75x = 358,130.39
  5. Step 5: Solve for x
    x = 358,130.39/644.75
  6. Step 6: Final answer
    x = 555.46

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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.