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Finding the Fourth Proportional to 1,339.68, 2,009.32 and 517.84

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Solution

The fourth proportional to 1,339.68, 2,009.32 and 517.84 is: 776.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.68 : 2,009.32 = 517.84 : x
  2. Step 2: Convert to fraction form
    1,339.68/2,009.32 = 517.84/x
  3. Step 3: Cross multiply
    1,339.68x = 2,009.32 × 517.84
  4. Step 4: Simplify right side
    1,339.68x = 1,040,506.27
  5. Step 5: Solve for x
    x = 1,040,506.27/1,339.68
  6. Step 6: Final answer
    x = 776.68

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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.