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Finding the Fourth Proportional to 714.43, 985.96 and 419.75

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Solution

The fourth proportional to 714.43, 985.96 and 419.75 is: 579.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.43 : 985.96 = 419.75 : x
  2. Step 2: Convert to fraction form
    714.43/985.96 = 419.75/x
  3. Step 3: Cross multiply
    714.43x = 985.96 × 419.75
  4. Step 4: Simplify right side
    714.43x = 413,856.00
  5. Step 5: Solve for x
    x = 413,856.00/714.43
  6. Step 6: Final answer
    x = 579.28

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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.