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Finding the Fourth Proportional to 717.96, 990.89 and 419.31

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Solution

The fourth proportional to 717.96, 990.89 and 419.31 is: 578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.96 : 990.89 = 419.31 : x
  2. Step 2: Convert to fraction form
    717.96/990.89 = 419.31/x
  3. Step 3: Cross multiply
    717.96x = 990.89 × 419.31
  4. Step 4: Simplify right side
    717.96x = 415,483.03
  5. Step 5: Solve for x
    x = 415,483.03/717.96
  6. Step 6: Final answer
    x = 578.70

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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.