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Finding the Fourth Proportional to 718.85, 991.94 and 404.12

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Solution

The fourth proportional to 718.85, 991.94 and 404.12 is: 557.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.85 : 991.94 = 404.12 : x
  2. Step 2: Convert to fraction form
    718.85/991.94 = 404.12/x
  3. Step 3: Cross multiply
    718.85x = 991.94 × 404.12
  4. Step 4: Simplify right side
    718.85x = 400,863.25
  5. Step 5: Solve for x
    x = 400,863.25/718.85
  6. Step 6: Final answer
    x = 557.64

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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.