Home / 1,986.78-2,740.05-1,239.96

Finding the Fourth Proportional to 1,986.78, 2,740.05 and 1,239.96

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Solution

The fourth proportional to 1,986.78, 2,740.05 and 1,239.96 is: 1,710.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.78 : 2,740.05 = 1,239.96 : x
  2. Step 2: Convert to fraction form
    1,986.78/2,740.05 = 1,239.96/x
  3. Step 3: Cross multiply
    1,986.78x = 2,740.05 × 1,239.96
  4. Step 4: Simplify right side
    1,986.78x = 3,397,552.40
  5. Step 5: Solve for x
    x = 3,397,552.40/1,986.78
  6. Step 6: Final answer
    x = 1,710.08

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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.