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Finding the Fourth Proportional to 718.74, 991.56 and 423.90

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Solution

The fourth proportional to 718.74, 991.56 and 423.90 is: 584.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.74 : 991.56 = 423.90 : x
  2. Step 2: Convert to fraction form
    718.74/991.56 = 423.90/x
  3. Step 3: Cross multiply
    718.74x = 991.56 × 423.90
  4. Step 4: Simplify right side
    718.74x = 420,322.28
  5. Step 5: Solve for x
    x = 420,322.28/718.74
  6. Step 6: Final answer
    x = 584.80

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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.