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Finding the Fourth Proportional to 1,339.86, 2,009.52 and 518.28

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Solution

The fourth proportional to 1,339.86, 2,009.52 and 518.28 is: 777.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.86 : 2,009.52 = 518.28 : x
  2. Step 2: Convert to fraction form
    1,339.86/2,009.52 = 518.28/x
  3. Step 3: Cross multiply
    1,339.86x = 2,009.52 × 518.28
  4. Step 4: Simplify right side
    1,339.86x = 1,041,494.03
  5. Step 5: Solve for x
    x = 1,041,494.03/1,339.86
  6. Step 6: Final answer
    x = 777.32

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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.