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Finding the Fourth Proportional to 718.14, 991.08 and 423.48

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Solution

The fourth proportional to 718.14, 991.08 and 423.48 is: 584.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.14 : 991.08 = 423.48 : x
  2. Step 2: Convert to fraction form
    718.14/991.08 = 423.48/x
  3. Step 3: Cross multiply
    718.14x = 991.08 × 423.48
  4. Step 4: Simplify right side
    718.14x = 419,702.56
  5. Step 5: Solve for x
    x = 419,702.56/718.14
  6. Step 6: Final answer
    x = 584.43

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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.