Home / 2,969.40-4,095.72-1,921.80

Finding the Fourth Proportional to 2,969.40, 4,095.72 and 1,921.80

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Solution

The fourth proportional to 2,969.40, 4,095.72 and 1,921.80 is: 2,650.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,969.40 : 4,095.72 = 1,921.80 : x
  2. Step 2: Convert to fraction form
    2,969.40/4,095.72 = 1,921.80/x
  3. Step 3: Cross multiply
    2,969.40x = 4,095.72 × 1,921.80
  4. Step 4: Simplify right side
    2,969.40x = 7,871,154.70
  5. Step 5: Solve for x
    x = 7,871,154.70/2,969.40
  6. Step 6: Final answer
    x = 2,650.76

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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.