Home / 1,987.29-2,740.55-1,278.41

Finding the Fourth Proportional to 1,987.29, 2,740.55 and 1,278.41

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Solution

The fourth proportional to 1,987.29, 2,740.55 and 1,278.41 is: 1,762.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.29 : 2,740.55 = 1,278.41 : x
  2. Step 2: Convert to fraction form
    1,987.29/2,740.55 = 1,278.41/x
  3. Step 3: Cross multiply
    1,987.29x = 2,740.55 × 1,278.41
  4. Step 4: Simplify right side
    1,987.29x = 3,503,526.43
  5. Step 5: Solve for x
    x = 3,503,526.43/1,987.29
  6. Step 6: Final answer
    x = 1,762.97

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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.