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Finding the Fourth Proportional to 672.08, 1,009.08 and 330.32

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Solution

The fourth proportional to 672.08, 1,009.08 and 330.32 is: 495.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.08 : 1,009.08 = 330.32 : x
  2. Step 2: Convert to fraction form
    672.08/1,009.08 = 330.32/x
  3. Step 3: Cross multiply
    672.08x = 1,009.08 × 330.32
  4. Step 4: Simplify right side
    672.08x = 333,319.31
  5. Step 5: Solve for x
    x = 333,319.31/672.08
  6. Step 6: Final answer
    x = 495.95

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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.