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Finding the Fourth Proportional to 678.97, 936.91 and 416.93

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Solution

The fourth proportional to 678.97, 936.91 and 416.93 is: 575.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.97 : 936.91 = 416.93 : x
  2. Step 2: Convert to fraction form
    678.97/936.91 = 416.93/x
  3. Step 3: Cross multiply
    678.97x = 936.91 × 416.93
  4. Step 4: Simplify right side
    678.97x = 390,625.89
  5. Step 5: Solve for x
    x = 390,625.89/678.97
  6. Step 6: Final answer
    x = 575.32

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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.