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Finding the Fourth Proportional to 644.03, 888.70 and 391.84

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Solution

The fourth proportional to 644.03, 888.70 and 391.84 is: 540.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.03 : 888.70 = 391.84 : x
  2. Step 2: Convert to fraction form
    644.03/888.70 = 391.84/x
  3. Step 3: Cross multiply
    644.03x = 888.70 × 391.84
  4. Step 4: Simplify right side
    644.03x = 348,224.64
  5. Step 5: Solve for x
    x = 348,224.64/644.03
  6. Step 6: Final answer
    x = 540.70

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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.