Home / 3,138.93-4,331.70-1,812.78

Finding the Fourth Proportional to 3,138.93, 4,331.70 and 1,812.78

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Solution

The fourth proportional to 3,138.93, 4,331.70 and 1,812.78 is: 2,501.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.93 : 4,331.70 = 1,812.78 : x
  2. Step 2: Convert to fraction form
    3,138.93/4,331.70 = 1,812.78/x
  3. Step 3: Cross multiply
    3,138.93x = 4,331.70 × 1,812.78
  4. Step 4: Simplify right side
    3,138.93x = 7,852,419.13
  5. Step 5: Solve for x
    x = 7,852,419.13/3,138.93
  6. Step 6: Final answer
    x = 2,501.62

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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.