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Finding the Fourth Proportional to 637.84, 879.87 and 438.69

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Solution

The fourth proportional to 637.84, 879.87 and 438.69 is: 605.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.84 : 879.87 = 438.69 : x
  2. Step 2: Convert to fraction form
    637.84/879.87 = 438.69/x
  3. Step 3: Cross multiply
    637.84x = 879.87 × 438.69
  4. Step 4: Simplify right side
    637.84x = 385,990.17
  5. Step 5: Solve for x
    x = 385,990.17/637.84
  6. Step 6: Final answer
    x = 605.15

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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.