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Finding the Fourth Proportional to 621.15, 856.62 and 496.82

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Solution

The fourth proportional to 621.15, 856.62 and 496.82 is: 685.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.15 : 856.62 = 496.82 : x
  2. Step 2: Convert to fraction form
    621.15/856.62 = 496.82/x
  3. Step 3: Cross multiply
    621.15x = 856.62 × 496.82
  4. Step 4: Simplify right side
    621.15x = 425,581.67
  5. Step 5: Solve for x
    x = 425,581.67/621.15
  6. Step 6: Final answer
    x = 685.15

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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.