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Finding the Fourth Proportional to 621.01, 856.77 and 355.48

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Solution

The fourth proportional to 621.01, 856.77 and 355.48 is: 490.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.01 : 856.77 = 355.48 : x
  2. Step 2: Convert to fraction form
    621.01/856.77 = 355.48/x
  3. Step 3: Cross multiply
    621.01x = 856.77 × 355.48
  4. Step 4: Simplify right side
    621.01x = 304,564.60
  5. Step 5: Solve for x
    x = 304,564.60/621.01
  6. Step 6: Final answer
    x = 490.43

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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.