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Finding the Fourth Proportional to 935.61, 1,291.22 and 620.34

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Solution

The fourth proportional to 935.61, 1,291.22 and 620.34 is: 856.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.61 : 1,291.22 = 620.34 : x
  2. Step 2: Convert to fraction form
    935.61/1,291.22 = 620.34/x
  3. Step 3: Cross multiply
    935.61x = 1,291.22 × 620.34
  4. Step 4: Simplify right side
    935.61x = 800,992.31
  5. Step 5: Solve for x
    x = 800,992.31/935.61
  6. Step 6: Final answer
    x = 856.12

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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.