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Finding the Fourth Proportional to 622.38, 931.68 and 505.74

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Solution

The fourth proportional to 622.38, 931.68 and 505.74 is: 757.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.38 : 931.68 = 505.74 : x
  2. Step 2: Convert to fraction form
    622.38/931.68 = 505.74/x
  3. Step 3: Cross multiply
    622.38x = 931.68 × 505.74
  4. Step 4: Simplify right side
    622.38x = 471,187.84
  5. Step 5: Solve for x
    x = 471,187.84/622.38
  6. Step 6: Final answer
    x = 757.07

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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.