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Finding the Fourth Proportional to 713, 984.12 and 402.68

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Solution

The fourth proportional to 713, 984.12 and 402.68 is: 555.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    713 : 984.12 = 402.68 : x
  2. Step 2: Convert to fraction form
    713/984.12 = 402.68/x
  3. Step 3: Cross multiply
    713x = 984.12 × 402.68
  4. Step 4: Simplify right side
    713x = 396,285.44
  5. Step 5: Solve for x
    x = 396,285.44/713
  6. Step 6: Final answer
    x = 555.80

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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.