Home / 1,372.40-2,053.80-1,122.72

Finding the Fourth Proportional to 1,372.40, 2,053.80 and 1,122.72

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Solution

The fourth proportional to 1,372.40, 2,053.80 and 1,122.72 is: 1,680.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.40 : 2,053.80 = 1,122.72 : x
  2. Step 2: Convert to fraction form
    1,372.40/2,053.80 = 1,122.72/x
  3. Step 3: Cross multiply
    1,372.40x = 2,053.80 × 1,122.72
  4. Step 4: Simplify right side
    1,372.40x = 2,305,842.34
  5. Step 5: Solve for x
    x = 2,305,842.34/1,372.40
  6. Step 6: Final answer
    x = 1,680.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.