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Finding the Fourth Proportional to 1,071.97, 1,479.23 and 678.85

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Solution

The fourth proportional to 1,071.97, 1,479.23 and 678.85 is: 936.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.97 : 1,479.23 = 678.85 : x
  2. Step 2: Convert to fraction form
    1,071.97/1,479.23 = 678.85/x
  3. Step 3: Cross multiply
    1,071.97x = 1,479.23 × 678.85
  4. Step 4: Simplify right side
    1,071.97x = 1,004,170.74
  5. Step 5: Solve for x
    x = 1,004,170.74/1,071.97
  6. Step 6: Final answer
    x = 936.75

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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.