Home / 2,142.10-2,955.45-1,257.40

Finding the Fourth Proportional to 2,142.10, 2,955.45 and 1,257.40

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Solution

The fourth proportional to 2,142.10, 2,955.45 and 1,257.40 is: 1,734.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.10 : 2,955.45 = 1,257.40 : x
  2. Step 2: Convert to fraction form
    2,142.10/2,955.45 = 1,257.40/x
  3. Step 3: Cross multiply
    2,142.10x = 2,955.45 × 1,257.40
  4. Step 4: Simplify right side
    2,142.10x = 3,716,182.83
  5. Step 5: Solve for x
    x = 3,716,182.83/2,142.10
  6. Step 6: Final answer
    x = 1,734.83

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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.