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Finding the Fourth Proportional to 716.78, 989.34 and 468.72

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Solution

The fourth proportional to 716.78, 989.34 and 468.72 is: 646.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.78 : 989.34 = 468.72 : x
  2. Step 2: Convert to fraction form
    716.78/989.34 = 468.72/x
  3. Step 3: Cross multiply
    716.78x = 989.34 × 468.72
  4. Step 4: Simplify right side
    716.78x = 463,723.44
  5. Step 5: Solve for x
    x = 463,723.44/716.78
  6. Step 6: Final answer
    x = 646.95

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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.