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Finding the Fourth Proportional to 936.09, 1,291.95 and 621.36

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Solution

The fourth proportional to 936.09, 1,291.95 and 621.36 is: 857.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.09 : 1,291.95 = 621.36 : x
  2. Step 2: Convert to fraction form
    936.09/1,291.95 = 621.36/x
  3. Step 3: Cross multiply
    936.09x = 1,291.95 × 621.36
  4. Step 4: Simplify right side
    936.09x = 802,766.05
  5. Step 5: Solve for x
    x = 802,766.05/936.09
  6. Step 6: Final answer
    x = 857.57

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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.