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Finding the Fourth Proportional to 836.56, 1,155 and 641.08

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Solution

The fourth proportional to 836.56, 1,155 and 641.08 is: 885.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.56 : 1,155 = 641.08 : x
  2. Step 2: Convert to fraction form
    836.56/1,155 = 641.08/x
  3. Step 3: Cross multiply
    836.56x = 1,155 × 641.08
  4. Step 4: Simplify right side
    836.56x = 740,447.40
  5. Step 5: Solve for x
    x = 740,447.40/836.56
  6. Step 6: Final answer
    x = 885.11

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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.