Home / 2,820.68-3,892.55-1,561.77

Finding the Fourth Proportional to 2,820.68, 3,892.55 and 1,561.77

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Solution

The fourth proportional to 2,820.68, 3,892.55 and 1,561.77 is: 2,155.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820.68 : 3,892.55 = 1,561.77 : x
  2. Step 2: Convert to fraction form
    2,820.68/3,892.55 = 1,561.77/x
  3. Step 3: Cross multiply
    2,820.68x = 3,892.55 × 1,561.77
  4. Step 4: Simplify right side
    2,820.68x = 6,079,267.81
  5. Step 5: Solve for x
    x = 6,079,267.81/2,820.68
  6. Step 6: Final answer
    x = 2,155.25

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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.