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Finding the Fourth Proportional to 1,719.43, 2,579.12 and 420.91

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Solution

The fourth proportional to 1,719.43, 2,579.12 and 420.91 is: 631.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.43 : 2,579.12 = 420.91 : x
  2. Step 2: Convert to fraction form
    1,719.43/2,579.12 = 420.91/x
  3. Step 3: Cross multiply
    1,719.43x = 2,579.12 × 420.91
  4. Step 4: Simplify right side
    1,719.43x = 1,085,570.43
  5. Step 5: Solve for x
    x = 1,085,570.43/1,719.43
  6. Step 6: Final answer
    x = 631.36

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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.