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Finding the Fourth Proportional to 716.56, 989.24 and 642.72

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Solution

The fourth proportional to 716.56, 989.24 and 642.72 is: 887.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.56 : 989.24 = 642.72 : x
  2. Step 2: Convert to fraction form
    716.56/989.24 = 642.72/x
  3. Step 3: Cross multiply
    716.56x = 989.24 × 642.72
  4. Step 4: Simplify right side
    716.56x = 635,804.33
  5. Step 5: Solve for x
    x = 635,804.33/716.56
  6. Step 6: Final answer
    x = 887.30

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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.