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Finding the Fourth Proportional to 1,339.22, 2,009.30 and 608.56

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Solution

The fourth proportional to 1,339.22, 2,009.30 and 608.56 is: 913.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.22 : 2,009.30 = 608.56 : x
  2. Step 2: Convert to fraction form
    1,339.22/2,009.30 = 608.56/x
  3. Step 3: Cross multiply
    1,339.22x = 2,009.30 × 608.56
  4. Step 4: Simplify right side
    1,339.22x = 1,222,771.54
  5. Step 5: Solve for x
    x = 1,222,771.54/1,339.22
  6. Step 6: Final answer
    x = 913.05

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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.