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Finding the Fourth Proportional to 718.36, 991.36 and 423.68

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Solution

The fourth proportional to 718.36, 991.36 and 423.68 is: 584.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.36 : 991.36 = 423.68 : x
  2. Step 2: Convert to fraction form
    718.36/991.36 = 423.68/x
  3. Step 3: Cross multiply
    718.36x = 991.36 × 423.68
  4. Step 4: Simplify right side
    718.36x = 420,019.40
  5. Step 5: Solve for x
    x = 420,019.40/718.36
  6. Step 6: Final answer
    x = 584.69

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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.