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Finding the Fourth Proportional to 672.09, 1,007.71 and 209.74

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Solution

The fourth proportional to 672.09, 1,007.71 and 209.74 is: 314.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.09 : 1,007.71 = 209.74 : x
  2. Step 2: Convert to fraction form
    672.09/1,007.71 = 209.74/x
  3. Step 3: Cross multiply
    672.09x = 1,007.71 × 209.74
  4. Step 4: Simplify right side
    672.09x = 211,357.10
  5. Step 5: Solve for x
    x = 211,357.10/672.09
  6. Step 6: Final answer
    x = 314.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.