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Finding the Fourth Proportional to 638.21, 879.98 and 544.66

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Solution

The fourth proportional to 638.21, 879.98 and 544.66 is: 750.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.21 : 879.98 = 544.66 : x
  2. Step 2: Convert to fraction form
    638.21/879.98 = 544.66/x
  3. Step 3: Cross multiply
    638.21x = 879.98 × 544.66
  4. Step 4: Simplify right side
    638.21x = 479,284.98
  5. Step 5: Solve for x
    x = 479,284.98/638.21
  6. Step 6: Final answer
    x = 750.98

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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.