Home / 1,719.51-2,579.22-420.99

Finding the Fourth Proportional to 1,719.51, 2,579.22 and 420.99

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Solution

The fourth proportional to 1,719.51, 2,579.22 and 420.99 is: 631.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.51 : 2,579.22 = 420.99 : x
  2. Step 2: Convert to fraction form
    1,719.51/2,579.22 = 420.99/x
  3. Step 3: Cross multiply
    1,719.51x = 2,579.22 × 420.99
  4. Step 4: Simplify right side
    1,719.51x = 1,085,825.83
  5. Step 5: Solve for x
    x = 1,085,825.83/1,719.51
  6. Step 6: Final answer
    x = 631.47

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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.