Home / 1,921.68-2,649.24-1,291.10

Finding the Fourth Proportional to 1,921.68, 2,649.24 and 1,291.10

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Solution

The fourth proportional to 1,921.68, 2,649.24 and 1,291.10 is: 1,779.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.68 : 2,649.24 = 1,291.10 : x
  2. Step 2: Convert to fraction form
    1,921.68/2,649.24 = 1,291.10/x
  3. Step 3: Cross multiply
    1,921.68x = 2,649.24 × 1,291.10
  4. Step 4: Simplify right side
    1,921.68x = 3,420,433.76
  5. Step 5: Solve for x
    x = 3,420,433.76/1,921.68
  6. Step 6: Final answer
    x = 1,779.92

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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.