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Finding the Fourth Proportional to 719.87, 993.43 and 425.31

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Solution

The fourth proportional to 719.87, 993.43 and 425.31 is: 586.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.87 : 993.43 = 425.31 : x
  2. Step 2: Convert to fraction form
    719.87/993.43 = 425.31/x
  3. Step 3: Cross multiply
    719.87x = 993.43 × 425.31
  4. Step 4: Simplify right side
    719.87x = 422,512.52
  5. Step 5: Solve for x
    x = 422,512.52/719.87
  6. Step 6: Final answer
    x = 586.93

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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.