Home / 1,778.70-2,455.50-1,220.20

Finding the Fourth Proportional to 1,778.70, 2,455.50 and 1,220.20

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Solution

The fourth proportional to 1,778.70, 2,455.50 and 1,220.20 is: 1,684.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.70 : 2,455.50 = 1,220.20 : x
  2. Step 2: Convert to fraction form
    1,778.70/2,455.50 = 1,220.20/x
  3. Step 3: Cross multiply
    1,778.70x = 2,455.50 × 1,220.20
  4. Step 4: Simplify right side
    1,778.70x = 2,996,201.10
  5. Step 5: Solve for x
    x = 2,996,201.10/1,778.70
  6. Step 6: Final answer
    x = 1,684.49

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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.