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Finding the Fourth Proportional to 621.36, 856.92 and 490.14

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Solution

The fourth proportional to 621.36, 856.92 and 490.14 is: 675.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.36 : 856.92 = 490.14 : x
  2. Step 2: Convert to fraction form
    621.36/856.92 = 490.14/x
  3. Step 3: Cross multiply
    621.36x = 856.92 × 490.14
  4. Step 4: Simplify right side
    621.36x = 420,010.77
  5. Step 5: Solve for x
    x = 420,010.77/621.36
  6. Step 6: Final answer
    x = 675.95

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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.