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Finding the Fourth Proportional to 1,072.72, 1,479.63 and 757.36

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Solution

The fourth proportional to 1,072.72, 1,479.63 and 757.36 is: 1,044.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.72 : 1,479.63 = 757.36 : x
  2. Step 2: Convert to fraction form
    1,072.72/1,479.63 = 757.36/x
  3. Step 3: Cross multiply
    1,072.72x = 1,479.63 × 757.36
  4. Step 4: Simplify right side
    1,072.72x = 1,120,612.58
  5. Step 5: Solve for x
    x = 1,120,612.58/1,072.72
  6. Step 6: Final answer
    x = 1,044.65

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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.