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Finding the Fourth Proportional to 628.85, 936.57 and 621.56

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Solution

The fourth proportional to 628.85, 936.57 and 621.56 is: 925.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.85 : 936.57 = 621.56 : x
  2. Step 2: Convert to fraction form
    628.85/936.57 = 621.56/x
  3. Step 3: Cross multiply
    628.85x = 936.57 × 621.56
  4. Step 4: Simplify right side
    628.85x = 582,129.77
  5. Step 5: Solve for x
    x = 582,129.77/628.85
  6. Step 6: Final answer
    x = 925.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.