Home / 2,120.36-2,925.42-1,281.38

Finding the Fourth Proportional to 2,120.36, 2,925.42 and 1,281.38

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Solution

The fourth proportional to 2,120.36, 2,925.42 and 1,281.38 is: 1,767.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.36 : 2,925.42 = 1,281.38 : x
  2. Step 2: Convert to fraction form
    2,120.36/2,925.42 = 1,281.38/x
  3. Step 3: Cross multiply
    2,120.36x = 2,925.42 × 1,281.38
  4. Step 4: Simplify right side
    2,120.36x = 3,748,574.68
  5. Step 5: Solve for x
    x = 3,748,574.68/2,120.36
  6. Step 6: Final answer
    x = 1,767.90

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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.