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Finding the Fourth Proportional to 678.33, 936.21 and 655.55

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Solution

The fourth proportional to 678.33, 936.21 and 655.55 is: 904.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.33 : 936.21 = 655.55 : x
  2. Step 2: Convert to fraction form
    678.33/936.21 = 655.55/x
  3. Step 3: Cross multiply
    678.33x = 936.21 × 655.55
  4. Step 4: Simplify right side
    678.33x = 613,727.78
  5. Step 5: Solve for x
    x = 613,727.78/678.33
  6. Step 6: Final answer
    x = 904.76

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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.