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Finding the Fourth Proportional to 621.18, 931.41 and 255.56

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Solution

The fourth proportional to 621.18, 931.41 and 255.56 is: 383.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.18 : 931.41 = 255.56 : x
  2. Step 2: Convert to fraction form
    621.18/931.41 = 255.56/x
  3. Step 3: Cross multiply
    621.18x = 931.41 × 255.56
  4. Step 4: Simplify right side
    621.18x = 238,026.48
  5. Step 5: Solve for x
    x = 238,026.48/621.18
  6. Step 6: Final answer
    x = 383.18

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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.