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Finding the Fourth Proportional to 1,109.71, 1,531.39 and 612.33

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Solution

The fourth proportional to 1,109.71, 1,531.39 and 612.33 is: 845.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.71 : 1,531.39 = 612.33 : x
  2. Step 2: Convert to fraction form
    1,109.71/1,531.39 = 612.33/x
  3. Step 3: Cross multiply
    1,109.71x = 1,531.39 × 612.33
  4. Step 4: Simplify right side
    1,109.71x = 937,718.53
  5. Step 5: Solve for x
    x = 937,718.53/1,109.71
  6. Step 6: Final answer
    x = 845.02

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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.