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Finding the Fourth Proportional to 1,339.82, 2,009 and 608.99

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Solution

The fourth proportional to 1,339.82, 2,009 and 608.99 is: 913.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.82 : 2,009 = 608.99 : x
  2. Step 2: Convert to fraction form
    1,339.82/2,009 = 608.99/x
  3. Step 3: Cross multiply
    1,339.82x = 2,009 × 608.99
  4. Step 4: Simplify right side
    1,339.82x = 1,223,460.91
  5. Step 5: Solve for x
    x = 1,223,460.91/1,339.82
  6. Step 6: Final answer
    x = 913.15

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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.