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Finding the Fourth Proportional to 1,231.70, 1,697.95 and 936.46

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Solution

The fourth proportional to 1,231.70, 1,697.95 and 936.46 is: 1,290.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.70 : 1,697.95 = 936.46 : x
  2. Step 2: Convert to fraction form
    1,231.70/1,697.95 = 936.46/x
  3. Step 3: Cross multiply
    1,231.70x = 1,697.95 × 936.46
  4. Step 4: Simplify right side
    1,231.70x = 1,590,062.26
  5. Step 5: Solve for x
    x = 1,590,062.26/1,231.70
  6. Step 6: Final answer
    x = 1,290.95

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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.