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Finding the Fourth Proportional to 3,856.88, 5,784.06 and 1,258.40

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Solution

The fourth proportional to 3,856.88, 5,784.06 and 1,258.40 is: 1,887.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.88 : 5,784.06 = 1,258.40 : x
  2. Step 2: Convert to fraction form
    3,856.88/5,784.06 = 1,258.40/x
  3. Step 3: Cross multiply
    3,856.88x = 5,784.06 × 1,258.40
  4. Step 4: Simplify right side
    3,856.88x = 7,278,661.10
  5. Step 5: Solve for x
    x = 7,278,661.10/3,856.88
  6. Step 6: Final answer
    x = 1,887.19

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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.