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Finding the Fourth Proportional to 718.48, 991.44 and 419.79

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Solution

The fourth proportional to 718.48, 991.44 and 419.79 is: 579.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.48 : 991.44 = 419.79 : x
  2. Step 2: Convert to fraction form
    718.48/991.44 = 419.79/x
  3. Step 3: Cross multiply
    718.48x = 991.44 × 419.79
  4. Step 4: Simplify right side
    718.48x = 416,196.60
  5. Step 5: Solve for x
    x = 416,196.60/718.48
  6. Step 6: Final answer
    x = 579.27

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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.