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Finding the Fourth Proportional to 621.49, 857.61 and 359.52

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Solution

The fourth proportional to 621.49, 857.61 and 359.52 is: 496.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.49 : 857.61 = 359.52 : x
  2. Step 2: Convert to fraction form
    621.49/857.61 = 359.52/x
  3. Step 3: Cross multiply
    621.49x = 857.61 × 359.52
  4. Step 4: Simplify right side
    621.49x = 308,327.95
  5. Step 5: Solve for x
    x = 308,327.95/621.49
  6. Step 6: Final answer
    x = 496.11

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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.