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Finding the Fourth Proportional to 714.35, 986.07 and 419.72

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Solution

The fourth proportional to 714.35, 986.07 and 419.72 is: 579.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.35 : 986.07 = 419.72 : x
  2. Step 2: Convert to fraction form
    714.35/986.07 = 419.72/x
  3. Step 3: Cross multiply
    714.35x = 986.07 × 419.72
  4. Step 4: Simplify right side
    714.35x = 413,869.94
  5. Step 5: Solve for x
    x = 413,869.94/714.35
  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.