Home / 2,120.10-2,921.10-1,420.26

Finding the Fourth Proportional to 2,120.10, 2,921.10 and 1,420.26

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Solution

The fourth proportional to 2,120.10, 2,921.10 and 1,420.26 is: 1,956.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.10 : 2,921.10 = 1,420.26 : x
  2. Step 2: Convert to fraction form
    2,120.10/2,921.10 = 1,420.26/x
  3. Step 3: Cross multiply
    2,120.10x = 2,921.10 × 1,420.26
  4. Step 4: Simplify right side
    2,120.10x = 4,148,721.49
  5. Step 5: Solve for x
    x = 4,148,721.49/2,120.10
  6. Step 6: Final answer
    x = 1,956.85

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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.