Home / 1,921.60-2,651.70-1,135.72

Finding the Fourth Proportional to 1,921.60, 2,651.70 and 1,135.72

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Solution

The fourth proportional to 1,921.60, 2,651.70 and 1,135.72 is: 1,567.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.60 : 2,651.70 = 1,135.72 : x
  2. Step 2: Convert to fraction form
    1,921.60/2,651.70 = 1,135.72/x
  3. Step 3: Cross multiply
    1,921.60x = 2,651.70 × 1,135.72
  4. Step 4: Simplify right side
    1,921.60x = 3,011,588.72
  5. Step 5: Solve for x
    x = 3,011,588.72/1,921.60
  6. Step 6: Final answer
    x = 1,567.23

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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.