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Finding the Fourth Proportional to 718.35, 991.44 and 423.62

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Solution

The fourth proportional to 718.35, 991.44 and 423.62 is: 584.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.35 : 991.44 = 423.62 : x
  2. Step 2: Convert to fraction form
    718.35/991.44 = 423.62/x
  3. Step 3: Cross multiply
    718.35x = 991.44 × 423.62
  4. Step 4: Simplify right side
    718.35x = 419,991.18
  5. Step 5: Solve for x
    x = 419,991.18/718.35
  6. Step 6: Final answer
    x = 584.66

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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.