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Finding the Fourth Proportional to 714.48, 986.37 and 419.75

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Solution

The fourth proportional to 714.48, 986.37 and 419.75 is: 579.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.48 : 986.37 = 419.75 : x
  2. Step 2: Convert to fraction form
    714.48/986.37 = 419.75/x
  3. Step 3: Cross multiply
    714.48x = 986.37 × 419.75
  4. Step 4: Simplify right side
    714.48x = 414,023.88
  5. Step 5: Solve for x
    x = 414,023.88/714.48
  6. Step 6: Final answer
    x = 579.48

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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.