Home / 1,921.28-2,647.68-1,368.32

Finding the Fourth Proportional to 1,921.28, 2,647.68 and 1,368.32

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Solution

The fourth proportional to 1,921.28, 2,647.68 and 1,368.32 is: 1,885.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.28 : 2,647.68 = 1,368.32 : x
  2. Step 2: Convert to fraction form
    1,921.28/2,647.68 = 1,368.32/x
  3. Step 3: Cross multiply
    1,921.28x = 2,647.68 × 1,368.32
  4. Step 4: Simplify right side
    1,921.28x = 3,622,873.50
  5. Step 5: Solve for x
    x = 3,622,873.50/1,921.28
  6. Step 6: Final answer
    x = 1,885.66

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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.