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Finding the Fourth Proportional to 936.63, 1,394.33 and 931.96

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Solution

The fourth proportional to 936.63, 1,394.33 and 931.96 is: 1,387.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.63 : 1,394.33 = 931.96 : x
  2. Step 2: Convert to fraction form
    936.63/1,394.33 = 931.96/x
  3. Step 3: Cross multiply
    936.63x = 1,394.33 × 931.96
  4. Step 4: Simplify right side
    936.63x = 1,299,459.79
  5. Step 5: Solve for x
    x = 1,299,459.79/936.63
  6. Step 6: Final answer
    x = 1,387.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.