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Finding the Fourth Proportional to 621.68, 857.91 and 352.49

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Solution

The fourth proportional to 621.68, 857.91 and 352.49 is: 486.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.68 : 857.91 = 352.49 : x
  2. Step 2: Convert to fraction form
    621.68/857.91 = 352.49/x
  3. Step 3: Cross multiply
    621.68x = 857.91 × 352.49
  4. Step 4: Simplify right side
    621.68x = 302,402.93
  5. Step 5: Solve for x
    x = 302,402.93/621.68
  6. Step 6: Final answer
    x = 486.43

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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.