Home / 2,285.40-3,154.13-1,290.72

Finding the Fourth Proportional to 2,285.40, 3,154.13 and 1,290.72

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Solution

The fourth proportional to 2,285.40, 3,154.13 and 1,290.72 is: 1,781.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,285.40 : 3,154.13 = 1,290.72 : x
  2. Step 2: Convert to fraction form
    2,285.40/3,154.13 = 1,290.72/x
  3. Step 3: Cross multiply
    2,285.40x = 3,154.13 × 1,290.72
  4. Step 4: Simplify right side
    2,285.40x = 4,071,076.45
  5. Step 5: Solve for x
    x = 4,071,076.45/2,285.40
  6. Step 6: Final answer
    x = 1,781.34

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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.