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Finding the Fourth Proportional to 713.32, 982.09 and 621.28

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Solution

The fourth proportional to 713.32, 982.09 and 621.28 is: 855.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.32 : 982.09 = 621.28 : x
  2. Step 2: Convert to fraction form
    713.32/982.09 = 621.28/x
  3. Step 3: Cross multiply
    713.32x = 982.09 × 621.28
  4. Step 4: Simplify right side
    713.32x = 610,144.86
  5. Step 5: Solve for x
    x = 610,144.86/713.32
  6. Step 6: Final answer
    x = 855.37

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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.