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Finding the Fourth Proportional to 933.75, 1,397.67 and 620.79

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Solution

The fourth proportional to 933.75, 1,397.67 and 620.79 is: 929.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.75 : 1,397.67 = 620.79 : x
  2. Step 2: Convert to fraction form
    933.75/1,397.67 = 620.79/x
  3. Step 3: Cross multiply
    933.75x = 1,397.67 × 620.79
  4. Step 4: Simplify right side
    933.75x = 867,659.56
  5. Step 5: Solve for x
    x = 867,659.56/933.75
  6. Step 6: Final answer
    x = 929.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.