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Finding the Fourth Proportional to 1,109.78, 1,531.38 and 612.39

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Solution

The fourth proportional to 1,109.78, 1,531.38 and 612.39 is: 845.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.78 : 1,531.38 = 612.39 : x
  2. Step 2: Convert to fraction form
    1,109.78/1,531.38 = 612.39/x
  3. Step 3: Cross multiply
    1,109.78x = 1,531.38 × 612.39
  4. Step 4: Simplify right side
    1,109.78x = 937,801.80
  5. Step 5: Solve for x
    x = 937,801.80/1,109.78
  6. Step 6: Final answer
    x = 845.03

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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.