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Finding the Fourth Proportional to 644.40, 888.84 and 457.86

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Solution

The fourth proportional to 644.40, 888.84 and 457.86 is: 631.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.40 : 888.84 = 457.86 : x
  2. Step 2: Convert to fraction form
    644.40/888.84 = 457.86/x
  3. Step 3: Cross multiply
    644.40x = 888.84 × 457.86
  4. Step 4: Simplify right side
    644.40x = 406,964.28
  5. Step 5: Solve for x
    x = 406,964.28/644.40
  6. Step 6: Final answer
    x = 631.54

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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.