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Finding the Fourth Proportional to 1,071.09, 1,478.21 and 672.82

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Solution

The fourth proportional to 1,071.09, 1,478.21 and 672.82 is: 928.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.09 : 1,478.21 = 672.82 : x
  2. Step 2: Convert to fraction form
    1,071.09/1,478.21 = 672.82/x
  3. Step 3: Cross multiply
    1,071.09x = 1,478.21 × 672.82
  4. Step 4: Simplify right side
    1,071.09x = 994,569.25
  5. Step 5: Solve for x
    x = 994,569.25/1,071.09
  6. Step 6: Final answer
    x = 928.56

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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.