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Finding the Fourth Proportional to 638.56, 881.22 and 555.94

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Solution

The fourth proportional to 638.56, 881.22 and 555.94 is: 767.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.56 : 881.22 = 555.94 : x
  2. Step 2: Convert to fraction form
    638.56/881.22 = 555.94/x
  3. Step 3: Cross multiply
    638.56x = 881.22 × 555.94
  4. Step 4: Simplify right side
    638.56x = 489,905.45
  5. Step 5: Solve for x
    x = 489,905.45/638.56
  6. Step 6: Final answer
    x = 767.20

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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.