Home / 1,971.40-2,720.45-1,087.20

Finding the Fourth Proportional to 1,971.40, 2,720.45 and 1,087.20

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Solution

The fourth proportional to 1,971.40, 2,720.45 and 1,087.20 is: 1,500.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.40 : 2,720.45 = 1,087.20 : x
  2. Step 2: Convert to fraction form
    1,971.40/2,720.45 = 1,087.20/x
  3. Step 3: Cross multiply
    1,971.40x = 2,720.45 × 1,087.20
  4. Step 4: Simplify right side
    1,971.40x = 2,957,673.24
  5. Step 5: Solve for x
    x = 2,957,673.24/1,971.40
  6. Step 6: Final answer
    x = 1,500.29

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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.