Home / 1,989.71-2,745.65-1,105.47

Finding the Fourth Proportional to 1,989.71, 2,745.65 and 1,105.47

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Solution

The fourth proportional to 1,989.71, 2,745.65 and 1,105.47 is: 1,525.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.71 : 2,745.65 = 1,105.47 : x
  2. Step 2: Convert to fraction form
    1,989.71/2,745.65 = 1,105.47/x
  3. Step 3: Cross multiply
    1,989.71x = 2,745.65 × 1,105.47
  4. Step 4: Simplify right side
    1,989.71x = 3,035,228.18
  5. Step 5: Solve for x
    x = 3,035,228.18/1,989.71
  6. Step 6: Final answer
    x = 1,525.47

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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.