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Finding the Fourth Proportional to 672.80, 1,009.19 and 282.87

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Solution

The fourth proportional to 672.80, 1,009.19 and 282.87 is: 424.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.80 : 1,009.19 = 282.87 : x
  2. Step 2: Convert to fraction form
    672.80/1,009.19 = 282.87/x
  3. Step 3: Cross multiply
    672.80x = 1,009.19 × 282.87
  4. Step 4: Simplify right side
    672.80x = 285,470.28
  5. Step 5: Solve for x
    x = 285,470.28/672.80
  6. Step 6: Final answer
    x = 424.31

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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.