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Finding the Fourth Proportional to 1,360.44, 1,875.96 and 1,221.12

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Solution

The fourth proportional to 1,360.44, 1,875.96 and 1,221.12 is: 1,683.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.44 : 1,875.96 = 1,221.12 : x
  2. Step 2: Convert to fraction form
    1,360.44/1,875.96 = 1,221.12/x
  3. Step 3: Cross multiply
    1,360.44x = 1,875.96 × 1,221.12
  4. Step 4: Simplify right side
    1,360.44x = 2,290,772.28
  5. Step 5: Solve for x
    x = 2,290,772.28/1,360.44
  6. Step 6: Final answer
    x = 1,683.85

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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.