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Finding the Fourth Proportional to 621.23, 855.85 and 511.34

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Solution

The fourth proportional to 621.23, 855.85 and 511.34 is: 704.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.23 : 855.85 = 511.34 : x
  2. Step 2: Convert to fraction form
    621.23/855.85 = 511.34/x
  3. Step 3: Cross multiply
    621.23x = 855.85 × 511.34
  4. Step 4: Simplify right side
    621.23x = 437,627.78
  5. Step 5: Solve for x
    x = 437,627.78/621.23
  6. Step 6: Final answer
    x = 704.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.