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Finding the Fourth Proportional to 620.52, 931.78 and 393.96

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Solution

The fourth proportional to 620.52, 931.78 and 393.96 is: 591.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.52 : 931.78 = 393.96 : x
  2. Step 2: Convert to fraction form
    620.52/931.78 = 393.96/x
  3. Step 3: Cross multiply
    620.52x = 931.78 × 393.96
  4. Step 4: Simplify right side
    620.52x = 367,084.05
  5. Step 5: Solve for x
    x = 367,084.05/620.52
  6. Step 6: Final answer
    x = 591.57

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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.