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Finding the Fourth Proportional to 672.08, 1,007.60 and 209.59

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Solution

The fourth proportional to 672.08, 1,007.60 and 209.59 is: 314.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.08 : 1,007.60 = 209.59 : x
  2. Step 2: Convert to fraction form
    672.08/1,007.60 = 209.59/x
  3. Step 3: Cross multiply
    672.08x = 1,007.60 × 209.59
  4. Step 4: Simplify right side
    672.08x = 211,179.32
  5. Step 5: Solve for x
    x = 211,179.32/672.08
  6. Step 6: Final answer
    x = 314.22

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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.