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Finding the Fourth Proportional to 621.90, 858.28 and 359.90

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Solution

The fourth proportional to 621.90, 858.28 and 359.90 is: 496.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.90 : 858.28 = 359.90 : x
  2. Step 2: Convert to fraction form
    621.90/858.28 = 359.90/x
  3. Step 3: Cross multiply
    621.90x = 858.28 × 359.90
  4. Step 4: Simplify right side
    621.90x = 308,894.97
  5. Step 5: Solve for x
    x = 308,894.97/621.90
  6. Step 6: Final answer
    x = 496.70

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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.