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Finding the Fourth Proportional to 621.55, 857.76 and 341.79

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Solution

The fourth proportional to 621.55, 857.76 and 341.79 is: 471.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.55 : 857.76 = 341.79 : x
  2. Step 2: Convert to fraction form
    621.55/857.76 = 341.79/x
  3. Step 3: Cross multiply
    621.55x = 857.76 × 341.79
  4. Step 4: Simplify right side
    621.55x = 293,173.15
  5. Step 5: Solve for x
    x = 293,173.15/621.55
  6. Step 6: Final answer
    x = 471.68

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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.