Home / 3,138.60-4,321.40-2,665.50

Finding the Fourth Proportional to 3,138.60, 4,321.40 and 2,665.50

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Solution

The fourth proportional to 3,138.60, 4,321.40 and 2,665.50 is: 3,670.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.60 : 4,321.40 = 2,665.50 : x
  2. Step 2: Convert to fraction form
    3,138.60/4,321.40 = 2,665.50/x
  3. Step 3: Cross multiply
    3,138.60x = 4,321.40 × 2,665.50
  4. Step 4: Simplify right side
    3,138.60x = 11,518,691.70
  5. Step 5: Solve for x
    x = 11,518,691.70/3,138.60
  6. Step 6: Final answer
    x = 3,670.01

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1.5x scale

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.