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Finding the Fourth Proportional to 1,719.05, 2,579.62 and 678.87

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Solution

The fourth proportional to 1,719.05, 2,579.62 and 678.87 is: 1,018.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.05 : 2,579.62 = 678.87 : x
  2. Step 2: Convert to fraction form
    1,719.05/2,579.62 = 678.87/x
  3. Step 3: Cross multiply
    1,719.05x = 2,579.62 × 678.87
  4. Step 4: Simplify right side
    1,719.05x = 1,751,224.93
  5. Step 5: Solve for x
    x = 1,751,224.93/1,719.05
  6. Step 6: Final answer
    x = 1,018.72

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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.