Home / 1,990.60-2,747.78-1,292

Finding the Fourth Proportional to 1,990.60, 2,747.78 and 1,292

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Solution

The fourth proportional to 1,990.60, 2,747.78 and 1,292 is: 1,783.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.60 : 2,747.78 = 1,292 : x
  2. Step 2: Convert to fraction form
    1,990.60/2,747.78 = 1,292/x
  3. Step 3: Cross multiply
    1,990.60x = 2,747.78 × 1,292
  4. Step 4: Simplify right side
    1,990.60x = 3,550,131.76
  5. Step 5: Solve for x
    x = 3,550,131.76/1,990.60
  6. Step 6: Final answer
    x = 1,783.45

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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.