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Finding the Fourth Proportional to 1,339.77, 2,019.84 and 1,245.81

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Solution

The fourth proportional to 1,339.77, 2,019.84 and 1,245.81 is: 1,878.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.77 : 2,019.84 = 1,245.81 : x
  2. Step 2: Convert to fraction form
    1,339.77/2,019.84 = 1,245.81/x
  3. Step 3: Cross multiply
    1,339.77x = 2,019.84 × 1,245.81
  4. Step 4: Simplify right side
    1,339.77x = 2,516,336.87
  5. Step 5: Solve for x
    x = 2,516,336.87/1,339.77
  6. Step 6: Final answer
    x = 1,878.19

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.