Home / 3,905.79-5,389.98-2,137.40

Finding the Fourth Proportional to 3,905.79, 5,389.98 and 2,137.40

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Solution

The fourth proportional to 3,905.79, 5,389.98 and 2,137.40 is: 2,949.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.79 : 5,389.98 = 2,137.40 : x
  2. Step 2: Convert to fraction form
    3,905.79/5,389.98 = 2,137.40/x
  3. Step 3: Cross multiply
    3,905.79x = 5,389.98 × 2,137.40
  4. Step 4: Simplify right side
    3,905.79x = 11,520,543.25
  5. Step 5: Solve for x
    x = 11,520,543.25/3,905.79
  6. Step 6: Final answer
    x = 2,949.61

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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.