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Finding the Fourth Proportional to 720.22, 991.92 and 621.94

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Solution

The fourth proportional to 720.22, 991.92 and 621.94 is: 856.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.22 : 991.92 = 621.94 : x
  2. Step 2: Convert to fraction form
    720.22/991.92 = 621.94/x
  3. Step 3: Cross multiply
    720.22x = 991.92 × 621.94
  4. Step 4: Simplify right side
    720.22x = 616,914.72
  5. Step 5: Solve for x
    x = 616,914.72/720.22
  6. Step 6: Final answer
    x = 856.56

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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.