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Finding the Fourth Proportional to 720.23, 991.85 and 626.81

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Solution

The fourth proportional to 720.23, 991.85 and 626.81 is: 863.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.23 : 991.85 = 626.81 : x
  2. Step 2: Convert to fraction form
    720.23/991.85 = 626.81/x
  3. Step 3: Cross multiply
    720.23x = 991.85 × 626.81
  4. Step 4: Simplify right side
    720.23x = 621,693.41
  5. Step 5: Solve for x
    x = 621,693.41/720.23
  6. Step 6: Final answer
    x = 863.19

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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.