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Finding the Fourth Proportional to 678.21, 935.94 and 412.71

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Solution

The fourth proportional to 678.21, 935.94 and 412.71 is: 569.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.21 : 935.94 = 412.71 : x
  2. Step 2: Convert to fraction form
    678.21/935.94 = 412.71/x
  3. Step 3: Cross multiply
    678.21x = 935.94 × 412.71
  4. Step 4: Simplify right side
    678.21x = 386,271.80
  5. Step 5: Solve for x
    x = 386,271.80/678.21
  6. Step 6: Final answer
    x = 569.55

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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.