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Finding the Fourth Proportional to 672.19, 1,008.54 and 442.04

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Solution

The fourth proportional to 672.19, 1,008.54 and 442.04 is: 663.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.19 : 1,008.54 = 442.04 : x
  2. Step 2: Convert to fraction form
    672.19/1,008.54 = 442.04/x
  3. Step 3: Cross multiply
    672.19x = 1,008.54 × 442.04
  4. Step 4: Simplify right side
    672.19x = 445,809.98
  5. Step 5: Solve for x
    x = 445,809.98/672.19
  6. Step 6: Final answer
    x = 663.22

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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.