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Finding the Fourth Proportional to 716.20, 987.78 and 454.28

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Solution

The fourth proportional to 716.20, 987.78 and 454.28 is: 626.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.20 : 987.78 = 454.28 : x
  2. Step 2: Convert to fraction form
    716.20/987.78 = 454.28/x
  3. Step 3: Cross multiply
    716.20x = 987.78 × 454.28
  4. Step 4: Simplify right side
    716.20x = 448,728.70
  5. Step 5: Solve for x
    x = 448,728.70/716.20
  6. Step 6: Final answer
    x = 626.54

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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.