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Finding the Fourth Proportional to 926.74, 1,391.67 and 620.56

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Solution

The fourth proportional to 926.74, 1,391.67 and 620.56 is: 931.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.74 : 1,391.67 = 620.56 : x
  2. Step 2: Convert to fraction form
    926.74/1,391.67 = 620.56/x
  3. Step 3: Cross multiply
    926.74x = 1,391.67 × 620.56
  4. Step 4: Simplify right side
    926.74x = 863,614.74
  5. Step 5: Solve for x
    x = 863,614.74/926.74
  6. Step 6: Final answer
    x = 931.88

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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.