Home / 1,418.40-2,127.60-727.20

Finding the Fourth Proportional to 1,418.40, 2,127.60 and 727.20

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Solution

The fourth proportional to 1,418.40, 2,127.60 and 727.20 is: 1,090.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.40 : 2,127.60 = 727.20 : x
  2. Step 2: Convert to fraction form
    1,418.40/2,127.60 = 727.20/x
  3. Step 3: Cross multiply
    1,418.40x = 2,127.60 × 727.20
  4. Step 4: Simplify right side
    1,418.40x = 1,547,190.72
  5. Step 5: Solve for x
    x = 1,547,190.72/1,418.40
  6. Step 6: Final answer
    x = 1,090.80

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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.