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Finding the Fourth Proportional to 936.09, 1,402.56 and 660.83

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Solution

The fourth proportional to 936.09, 1,402.56 and 660.83 is: 990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.09 : 1,402.56 = 660.83 : x
  2. Step 2: Convert to fraction form
    936.09/1,402.56 = 660.83/x
  3. Step 3: Cross multiply
    936.09x = 1,402.56 × 660.83
  4. Step 4: Simplify right side
    936.09x = 926,846.71
  5. Step 5: Solve for x
    x = 926,846.71/936.09
  6. Step 6: Final answer
    x = 990.13

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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.