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Finding the Fourth Proportional to 612.98, 845.56 and 447

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Solution

The fourth proportional to 612.98, 845.56 and 447 is: 616.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.98 : 845.56 = 447 : x
  2. Step 2: Convert to fraction form
    612.98/845.56 = 447/x
  3. Step 3: Cross multiply
    612.98x = 845.56 × 447
  4. Step 4: Simplify right side
    612.98x = 377,965.32
  5. Step 5: Solve for x
    x = 377,965.32/612.98
  6. Step 6: Final answer
    x = 616.60

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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.