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Finding the Fourth Proportional to 935.22, 1,290.80 and 620.51

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Solution

The fourth proportional to 935.22, 1,290.80 and 620.51 is: 856.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.22 : 1,290.80 = 620.51 : x
  2. Step 2: Convert to fraction form
    935.22/1,290.80 = 620.51/x
  3. Step 3: Cross multiply
    935.22x = 1,290.80 × 620.51
  4. Step 4: Simplify right side
    935.22x = 800,954.31
  5. Step 5: Solve for x
    x = 800,954.31/935.22
  6. Step 6: Final answer
    x = 856.43

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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.