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Finding the Fourth Proportional to 672.87, 1,010.32 and 399.09

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Solution

The fourth proportional to 672.87, 1,010.32 and 399.09 is: 599.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.87 : 1,010.32 = 399.09 : x
  2. Step 2: Convert to fraction form
    672.87/1,010.32 = 399.09/x
  3. Step 3: Cross multiply
    672.87x = 1,010.32 × 399.09
  4. Step 4: Simplify right side
    672.87x = 403,208.61
  5. Step 5: Solve for x
    x = 403,208.61/672.87
  6. Step 6: Final answer
    x = 599.24

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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.