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Finding the Fourth Proportional to 672.49, 1,009.20 and 261.63

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Solution

The fourth proportional to 672.49, 1,009.20 and 261.63 is: 392.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.49 : 1,009.20 = 261.63 : x
  2. Step 2: Convert to fraction form
    672.49/1,009.20 = 261.63/x
  3. Step 3: Cross multiply
    672.49x = 1,009.20 × 261.63
  4. Step 4: Simplify right side
    672.49x = 264,036.14
  5. Step 5: Solve for x
    x = 264,036.14/672.49
  6. Step 6: Final answer
    x = 392.62

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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.