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Finding the Fourth Proportional to 613.80, 847.44 and 551.43

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Solution

The fourth proportional to 613.80, 847.44 and 551.43 is: 761.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.80 : 847.44 = 551.43 : x
  2. Step 2: Convert to fraction form
    613.80/847.44 = 551.43/x
  3. Step 3: Cross multiply
    613.80x = 847.44 × 551.43
  4. Step 4: Simplify right side
    613.80x = 467,303.84
  5. Step 5: Solve for x
    x = 467,303.84/613.80
  6. Step 6: Final answer
    x = 761.33

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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.