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Finding the Fourth Proportional to 672.80, 1,009.28 and 239.88

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Solution

The fourth proportional to 672.80, 1,009.28 and 239.88 is: 359.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.80 : 1,009.28 = 239.88 : x
  2. Step 2: Convert to fraction form
    672.80/1,009.28 = 239.88/x
  3. Step 3: Cross multiply
    672.80x = 1,009.28 × 239.88
  4. Step 4: Simplify right side
    672.80x = 242,106.09
  5. Step 5: Solve for x
    x = 242,106.09/672.80
  6. Step 6: Final answer
    x = 359.85

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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.