Home / 2,121.29-2,926.18-1,281.72

Finding the Fourth Proportional to 2,121.29, 2,926.18 and 1,281.72

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Solution

The fourth proportional to 2,121.29, 2,926.18 and 1,281.72 is: 1,768.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.29 : 2,926.18 = 1,281.72 : x
  2. Step 2: Convert to fraction form
    2,121.29/2,926.18 = 1,281.72/x
  3. Step 3: Cross multiply
    2,121.29x = 2,926.18 × 1,281.72
  4. Step 4: Simplify right side
    2,121.29x = 3,750,548.80
  5. Step 5: Solve for x
    x = 3,750,548.80/2,121.29
  6. Step 6: Final answer
    x = 1,768.05

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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.