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Finding the Fourth Proportional to 621.26, 931.16 and 255.59

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Solution

The fourth proportional to 621.26, 931.16 and 255.59 is: 383.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.26 : 931.16 = 255.59 : x
  2. Step 2: Convert to fraction form
    621.26/931.16 = 255.59/x
  3. Step 3: Cross multiply
    621.26x = 931.16 × 255.59
  4. Step 4: Simplify right side
    621.26x = 237,991.17
  5. Step 5: Solve for x
    x = 237,991.17/621.26
  6. Step 6: Final answer
    x = 383.08

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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.