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Finding the Fourth Proportional to 3,920.88, 5,410.79 and 2,128.40

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Solution

The fourth proportional to 3,920.88, 5,410.79 and 2,128.40 is: 2,937.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.88 : 5,410.79 = 2,128.40 : x
  2. Step 2: Convert to fraction form
    3,920.88/5,410.79 = 2,128.40/x
  3. Step 3: Cross multiply
    3,920.88x = 5,410.79 × 2,128.40
  4. Step 4: Simplify right side
    3,920.88x = 11,516,303.70
  5. Step 5: Solve for x
    x = 11,516,303.70/3,920.88
  6. Step 6: Final answer
    x = 2,937.17

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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.