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Finding the Fourth Proportional to 2,155.40, 3,233.40 and 856.57

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Solution

The fourth proportional to 2,155.40, 3,233.40 and 856.57 is: 1,284.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.40 : 3,233.40 = 856.57 : x
  2. Step 2: Convert to fraction form
    2,155.40/3,233.40 = 856.57/x
  3. Step 3: Cross multiply
    2,155.40x = 3,233.40 × 856.57
  4. Step 4: Simplify right side
    2,155.40x = 2,769,617.27
  5. Step 5: Solve for x
    x = 2,769,617.27/2,155.40
  6. Step 6: Final answer
    x = 1,284.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.