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Finding the Fourth Proportional to 641.22, 883.57 and 442.11

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Solution

The fourth proportional to 641.22, 883.57 and 442.11 is: 609.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.22 : 883.57 = 442.11 : x
  2. Step 2: Convert to fraction form
    641.22/883.57 = 442.11/x
  3. Step 3: Cross multiply
    641.22x = 883.57 × 442.11
  4. Step 4: Simplify right side
    641.22x = 390,633.82
  5. Step 5: Solve for x
    x = 390,633.82/641.22
  6. Step 6: Final answer
    x = 609.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.