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Finding the Fourth Proportional to 678.11, 936.17 and 465.74

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Solution

The fourth proportional to 678.11, 936.17 and 465.74 is: 642.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.11 : 936.17 = 465.74 : x
  2. Step 2: Convert to fraction form
    678.11/936.17 = 465.74/x
  3. Step 3: Cross multiply
    678.11x = 936.17 × 465.74
  4. Step 4: Simplify right side
    678.11x = 436,009.22
  5. Step 5: Solve for x
    x = 436,009.22/678.11
  6. Step 6: Final answer
    x = 642.97

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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.