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Finding the Fourth Proportional to 1,009.26, 1,392.85 and 611.02

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Solution

The fourth proportional to 1,009.26, 1,392.85 and 611.02 is: 843.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.26 : 1,392.85 = 611.02 : x
  2. Step 2: Convert to fraction form
    1,009.26/1,392.85 = 611.02/x
  3. Step 3: Cross multiply
    1,009.26x = 1,392.85 × 611.02
  4. Step 4: Simplify right side
    1,009.26x = 851,059.21
  5. Step 5: Solve for x
    x = 851,059.21/1,009.26
  6. Step 6: Final answer
    x = 843.25

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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.