Home / 1,987.95-2,740.79-1,278.53

Finding the Fourth Proportional to 1,987.95, 2,740.79 and 1,278.53

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Solution

The fourth proportional to 1,987.95, 2,740.79 and 1,278.53 is: 1,762.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.95 : 2,740.79 = 1,278.53 : x
  2. Step 2: Convert to fraction form
    1,987.95/2,740.79 = 1,278.53/x
  3. Step 3: Cross multiply
    1,987.95x = 2,740.79 × 1,278.53
  4. Step 4: Simplify right side
    1,987.95x = 3,504,162.14
  5. Step 5: Solve for x
    x = 3,504,162.14/1,987.95
  6. Step 6: Final answer
    x = 1,762.70

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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.