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Finding the Fourth Proportional to 641.28, 884.98 and 346.55

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Solution

The fourth proportional to 641.28, 884.98 and 346.55 is: 478.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.28 : 884.98 = 346.55 : x
  2. Step 2: Convert to fraction form
    641.28/884.98 = 346.55/x
  3. Step 3: Cross multiply
    641.28x = 884.98 × 346.55
  4. Step 4: Simplify right side
    641.28x = 306,688.86
  5. Step 5: Solve for x
    x = 306,688.86/641.28
  6. Step 6: Final answer
    x = 478.24

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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.