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Finding the Fourth Proportional to 716.90, 988.98 and 451.22

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Solution

The fourth proportional to 716.90, 988.98 and 451.22 is: 622.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.90 : 988.98 = 451.22 : x
  2. Step 2: Convert to fraction form
    716.90/988.98 = 451.22/x
  3. Step 3: Cross multiply
    716.90x = 988.98 × 451.22
  4. Step 4: Simplify right side
    716.90x = 446,246.21
  5. Step 5: Solve for x
    x = 446,246.21/716.90
  6. Step 6: Final answer
    x = 622.47

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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.