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Finding the Fourth Proportional to 672.19, 1,007.82 and 342.72

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Solution

The fourth proportional to 672.19, 1,007.82 and 342.72 is: 513.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.19 : 1,007.82 = 342.72 : x
  2. Step 2: Convert to fraction form
    672.19/1,007.82 = 342.72/x
  3. Step 3: Cross multiply
    672.19x = 1,007.82 × 342.72
  4. Step 4: Simplify right side
    672.19x = 345,400.07
  5. Step 5: Solve for x
    x = 345,400.07/672.19
  6. Step 6: Final answer
    x = 513.84

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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.