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Finding the Fourth Proportional to 1,072.18, 1,479.21 and 757.97

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Solution

The fourth proportional to 1,072.18, 1,479.21 and 757.97 is: 1,045.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.18 : 1,479.21 = 757.97 : x
  2. Step 2: Convert to fraction form
    1,072.18/1,479.21 = 757.97/x
  3. Step 3: Cross multiply
    1,072.18x = 1,479.21 × 757.97
  4. Step 4: Simplify right side
    1,072.18x = 1,121,200.50
  5. Step 5: Solve for x
    x = 1,121,200.50/1,072.18
  6. Step 6: Final answer
    x = 1,045.72

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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.