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Finding the Fourth Proportional to 1,076.28, 1,611.82 and 612.65

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Solution

The fourth proportional to 1,076.28, 1,611.82 and 612.65 is: 917.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.28 : 1,611.82 = 612.65 : x
  2. Step 2: Convert to fraction form
    1,076.28/1,611.82 = 612.65/x
  3. Step 3: Cross multiply
    1,076.28x = 1,611.82 × 612.65
  4. Step 4: Simplify right side
    1,076.28x = 987,487.47
  5. Step 5: Solve for x
    x = 987,487.47/1,076.28
  6. Step 6: Final answer
    x = 917.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.