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Finding the Fourth Proportional to 718.37, 991.35 and 419.82

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Solution

The fourth proportional to 718.37, 991.35 and 419.82 is: 579.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.37 : 991.35 = 419.82 : x
  2. Step 2: Convert to fraction form
    718.37/991.35 = 419.82/x
  3. Step 3: Cross multiply
    718.37x = 991.35 × 419.82
  4. Step 4: Simplify right side
    718.37x = 416,193.85
  5. Step 5: Solve for x
    x = 416,193.85/718.37
  6. Step 6: Final answer
    x = 579.36

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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.