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Finding the Fourth Proportional to 1,388.95, 2,081.37 and 608.25

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Solution

The fourth proportional to 1,388.95, 2,081.37 and 608.25 is: 911.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.95 : 2,081.37 = 608.25 : x
  2. Step 2: Convert to fraction form
    1,388.95/2,081.37 = 608.25/x
  3. Step 3: Cross multiply
    1,388.95x = 2,081.37 × 608.25
  4. Step 4: Simplify right side
    1,388.95x = 1,265,993.30
  5. Step 5: Solve for x
    x = 1,265,993.30/1,388.95
  6. Step 6: Final answer
    x = 911.48

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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.