Home / 3,129.77-4,320.64-1,803.21

Finding the Fourth Proportional to 3,129.77, 4,320.64 and 1,803.21

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Solution

The fourth proportional to 3,129.77, 4,320.64 and 1,803.21 is: 2,489.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.77 : 4,320.64 = 1,803.21 : x
  2. Step 2: Convert to fraction form
    3,129.77/4,320.64 = 1,803.21/x
  3. Step 3: Cross multiply
    3,129.77x = 4,320.64 × 1,803.21
  4. Step 4: Simplify right side
    3,129.77x = 7,791,021.25
  5. Step 5: Solve for x
    x = 7,791,021.25/3,129.77
  6. Step 6: Final answer
    x = 2,489.33

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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.