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Finding the Fourth Proportional to 613.98, 848.40 and 447.90

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Solution

The fourth proportional to 613.98, 848.40 and 447.90 is: 618.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.98 : 848.40 = 447.90 : x
  2. Step 2: Convert to fraction form
    613.98/848.40 = 447.90/x
  3. Step 3: Cross multiply
    613.98x = 848.40 × 447.90
  4. Step 4: Simplify right side
    613.98x = 379,998.36
  5. Step 5: Solve for x
    x = 379,998.36/613.98
  6. Step 6: Final answer
    x = 618.91

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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.