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Finding the Fourth Proportional to 714.77, 986.37 and 419.98

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Solution

The fourth proportional to 714.77, 986.37 and 419.98 is: 579.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.77 : 986.37 = 419.98 : x
  2. Step 2: Convert to fraction form
    714.77/986.37 = 419.98/x
  3. Step 3: Cross multiply
    714.77x = 986.37 × 419.98
  4. Step 4: Simplify right side
    714.77x = 414,255.67
  5. Step 5: Solve for x
    x = 414,255.67/714.77
  6. Step 6: Final answer
    x = 579.56

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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.