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Finding the Fourth Proportional to 1,072.64, 1,479.87 and 674.12

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Solution

The fourth proportional to 1,072.64, 1,479.87 and 674.12 is: 930.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.64 : 1,479.87 = 674.12 : x
  2. Step 2: Convert to fraction form
    1,072.64/1,479.87 = 674.12/x
  3. Step 3: Cross multiply
    1,072.64x = 1,479.87 × 674.12
  4. Step 4: Simplify right side
    1,072.64x = 997,613.66
  5. Step 5: Solve for x
    x = 997,613.66/1,072.64
  6. Step 6: Final answer
    x = 930.05

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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.