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Finding the Fourth Proportional to 641.93, 885.87 and 379.89

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Solution

The fourth proportional to 641.93, 885.87 and 379.89 is: 524.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.93 : 885.87 = 379.89 : x
  2. Step 2: Convert to fraction form
    641.93/885.87 = 379.89/x
  3. Step 3: Cross multiply
    641.93x = 885.87 × 379.89
  4. Step 4: Simplify right side
    641.93x = 336,533.15
  5. Step 5: Solve for x
    x = 336,533.15/641.93
  6. Step 6: Final answer
    x = 524.26

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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.