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Finding the Fourth Proportional to 716.62, 989.04 and 455.40

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Solution

The fourth proportional to 716.62, 989.04 and 455.40 is: 628.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.62 : 989.04 = 455.40 : x
  2. Step 2: Convert to fraction form
    716.62/989.04 = 455.40/x
  3. Step 3: Cross multiply
    716.62x = 989.04 × 455.40
  4. Step 4: Simplify right side
    716.62x = 450,408.82
  5. Step 5: Solve for x
    x = 450,408.82/716.62
  6. Step 6: Final answer
    x = 628.52

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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.