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Finding the Fourth Proportional to 672.14, 1,009.02 and 398.54

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Solution

The fourth proportional to 672.14, 1,009.02 and 398.54 is: 598.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.14 : 1,009.02 = 398.54 : x
  2. Step 2: Convert to fraction form
    672.14/1,009.02 = 398.54/x
  3. Step 3: Cross multiply
    672.14x = 1,009.02 × 398.54
  4. Step 4: Simplify right side
    672.14x = 402,134.83
  5. Step 5: Solve for x
    x = 402,134.83/672.14
  6. Step 6: Final answer
    x = 598.29

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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.