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Finding the Fourth Proportional to 935.91, 1,291.86 and 641.61

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Solution

The fourth proportional to 935.91, 1,291.86 and 641.61 is: 885.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.91 : 1,291.86 = 641.61 : x
  2. Step 2: Convert to fraction form
    935.91/1,291.86 = 641.61/x
  3. Step 3: Cross multiply
    935.91x = 1,291.86 × 641.61
  4. Step 4: Simplify right side
    935.91x = 828,870.29
  5. Step 5: Solve for x
    x = 828,870.29/935.91
  6. Step 6: Final answer
    x = 885.63

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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.