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Finding the Fourth Proportional to 936.90, 1,402.65 and 839.70

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Solution

The fourth proportional to 936.90, 1,402.65 and 839.70 is: 1,257.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.90 : 1,402.65 = 839.70 : x
  2. Step 2: Convert to fraction form
    936.90/1,402.65 = 839.70/x
  3. Step 3: Cross multiply
    936.90x = 1,402.65 × 839.70
  4. Step 4: Simplify right side
    936.90x = 1,177,805.21
  5. Step 5: Solve for x
    x = 1,177,805.21/936.90
  6. Step 6: Final answer
    x = 1,257.13

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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.