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Finding the Fourth Proportional to 621.24, 931.65 and 255.81

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Solution

The fourth proportional to 621.24, 931.65 and 255.81 is: 383.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.24 : 931.65 = 255.81 : x
  2. Step 2: Convert to fraction form
    621.24/931.65 = 255.81/x
  3. Step 3: Cross multiply
    621.24x = 931.65 × 255.81
  4. Step 4: Simplify right side
    621.24x = 238,325.39
  5. Step 5: Solve for x
    x = 238,325.39/621.24
  6. Step 6: Final answer
    x = 383.63

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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.