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Finding the Fourth Proportional to 721.71, 993.99 and 623.43

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Solution

The fourth proportional to 721.71, 993.99 and 623.43 is: 858.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.71 : 993.99 = 623.43 : x
  2. Step 2: Convert to fraction form
    721.71/993.99 = 623.43/x
  3. Step 3: Cross multiply
    721.71x = 993.99 × 623.43
  4. Step 4: Simplify right side
    721.71x = 619,683.19
  5. Step 5: Solve for x
    x = 619,683.19/721.71
  6. Step 6: Final answer
    x = 858.63

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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.