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Finding the Fourth Proportional to 621.13, 930.89 and 255.55

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Solution

The fourth proportional to 621.13, 930.89 and 255.55 is: 382.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.13 : 930.89 = 255.55 : x
  2. Step 2: Convert to fraction form
    621.13/930.89 = 255.55/x
  3. Step 3: Cross multiply
    621.13x = 930.89 × 255.55
  4. Step 4: Simplify right side
    621.13x = 237,887.66
  5. Step 5: Solve for x
    x = 237,887.66/621.13
  6. Step 6: Final answer
    x = 382.99

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1.5x scale

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.