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Finding the Fourth Proportional to 678.04, 939.97 and 641.08

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Solution

The fourth proportional to 678.04, 939.97 and 641.08 is: 888.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.04 : 939.97 = 641.08 : x
  2. Step 2: Convert to fraction form
    678.04/939.97 = 641.08/x
  3. Step 3: Cross multiply
    678.04x = 939.97 × 641.08
  4. Step 4: Simplify right side
    678.04x = 602,597.94
  5. Step 5: Solve for x
    x = 602,597.94/678.04
  6. Step 6: Final answer
    x = 888.74

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.