Home / 1,780.40-2,654.78-1,661.20

Finding the Fourth Proportional to 1,780.40, 2,654.78 and 1,661.20

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Solution

The fourth proportional to 1,780.40, 2,654.78 and 1,661.20 is: 2,477.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.40 : 2,654.78 = 1,661.20 : x
  2. Step 2: Convert to fraction form
    1,780.40/2,654.78 = 1,661.20/x
  3. Step 3: Cross multiply
    1,780.40x = 2,654.78 × 1,661.20
  4. Step 4: Simplify right side
    1,780.40x = 4,410,120.54
  5. Step 5: Solve for x
    x = 4,410,120.54/1,780.40
  6. Step 6: Final answer
    x = 2,477.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.