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Finding the Fourth Proportional to 935.96, 1,291.82 and 641.61

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Solution

The fourth proportional to 935.96, 1,291.82 and 641.61 is: 885.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.96 : 1,291.82 = 641.61 : x
  2. Step 2: Convert to fraction form
    935.96/1,291.82 = 641.61/x
  3. Step 3: Cross multiply
    935.96x = 1,291.82 × 641.61
  4. Step 4: Simplify right side
    935.96x = 828,841.42
  5. Step 5: Solve for x
    x = 828,841.42/935.96
  6. Step 6: Final answer
    x = 885.56

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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.