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Finding the Fourth Proportional to 641.36, 885.08 and 346.63

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Solution

The fourth proportional to 641.36, 885.08 and 346.63 is: 478.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.36 : 885.08 = 346.63 : x
  2. Step 2: Convert to fraction form
    641.36/885.08 = 346.63/x
  3. Step 3: Cross multiply
    641.36x = 885.08 × 346.63
  4. Step 4: Simplify right side
    641.36x = 306,793.55
  5. Step 5: Solve for x
    x = 306,793.55/641.36
  6. Step 6: Final answer
    x = 478.35

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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.