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Finding the Fourth Proportional to 936.20, 1,405.02 and 808.52

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Solution

The fourth proportional to 936.20, 1,405.02 and 808.52 is: 1,213.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.20 : 1,405.02 = 808.52 : x
  2. Step 2: Convert to fraction form
    936.20/1,405.02 = 808.52/x
  3. Step 3: Cross multiply
    936.20x = 1,405.02 × 808.52
  4. Step 4: Simplify right side
    936.20x = 1,135,986.77
  5. Step 5: Solve for x
    x = 1,135,986.77/936.20
  6. Step 6: Final answer
    x = 1,213.40

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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.