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Finding the Fourth Proportional to 1,258.06, 1,887.86 and 858.25

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Solution

The fourth proportional to 1,258.06, 1,887.86 and 858.25 is: 1,287.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.06 : 1,887.86 = 858.25 : x
  2. Step 2: Convert to fraction form
    1,258.06/1,887.86 = 858.25/x
  3. Step 3: Cross multiply
    1,258.06x = 1,887.86 × 858.25
  4. Step 4: Simplify right side
    1,258.06x = 1,620,255.85
  5. Step 5: Solve for x
    x = 1,620,255.85/1,258.06
  6. Step 6: Final answer
    x = 1,287.90

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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.