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Finding the Fourth Proportional to 935.92, 1,291.71 and 620.56

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Solution

The fourth proportional to 935.92, 1,291.71 and 620.56 is: 856.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.92 : 1,291.71 = 620.56 : x
  2. Step 2: Convert to fraction form
    935.92/1,291.71 = 620.56/x
  3. Step 3: Cross multiply
    935.92x = 1,291.71 × 620.56
  4. Step 4: Simplify right side
    935.92x = 801,583.56
  5. Step 5: Solve for x
    x = 801,583.56/935.92
  6. Step 6: Final answer
    x = 856.47

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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.