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Finding the Fourth Proportional to 621.51, 856.44 and 613.83

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Solution

The fourth proportional to 621.51, 856.44 and 613.83 is: 845.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.51 : 856.44 = 613.83 : x
  2. Step 2: Convert to fraction form
    621.51/856.44 = 613.83/x
  3. Step 3: Cross multiply
    621.51x = 856.44 × 613.83
  4. Step 4: Simplify right side
    621.51x = 525,708.57
  5. Step 5: Solve for x
    x = 525,708.57/621.51
  6. Step 6: Final answer
    x = 845.86

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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.