Home / 2,561.79-3,535.45-1,931.21

Finding the Fourth Proportional to 2,561.79, 3,535.45 and 1,931.21

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Solution

The fourth proportional to 2,561.79, 3,535.45 and 1,931.21 is: 2,665.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,561.79 : 3,535.45 = 1,931.21 : x
  2. Step 2: Convert to fraction form
    2,561.79/3,535.45 = 1,931.21/x
  3. Step 3: Cross multiply
    2,561.79x = 3,535.45 × 1,931.21
  4. Step 4: Simplify right side
    2,561.79x = 6,827,687.15
  5. Step 5: Solve for x
    x = 6,827,687.15/2,561.79
  6. Step 6: Final answer
    x = 2,665.20

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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.