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Finding the Fourth Proportional to 718.56, 991.60 and 423.84

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Solution

The fourth proportional to 718.56, 991.60 and 423.84 is: 584.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.56 : 991.60 = 423.84 : x
  2. Step 2: Convert to fraction form
    718.56/991.60 = 423.84/x
  3. Step 3: Cross multiply
    718.56x = 991.60 × 423.84
  4. Step 4: Simplify right side
    718.56x = 420,279.74
  5. Step 5: Solve for x
    x = 420,279.74/718.56
  6. Step 6: Final answer
    x = 584.89

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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.