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Finding the Fourth Proportional to 641.14, 961.72 and 478.94

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Solution

The fourth proportional to 641.14, 961.72 and 478.94 is: 718.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.14 : 961.72 = 478.94 : x
  2. Step 2: Convert to fraction form
    641.14/961.72 = 478.94/x
  3. Step 3: Cross multiply
    641.14x = 961.72 × 478.94
  4. Step 4: Simplify right side
    641.14x = 460,606.18
  5. Step 5: Solve for x
    x = 460,606.18/641.14
  6. Step 6: Final answer
    x = 718.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.