Home / 1,720.17-2,579.70-679.98

Finding the Fourth Proportional to 1,720.17, 2,579.70 and 679.98

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Solution

The fourth proportional to 1,720.17, 2,579.70 and 679.98 is: 1,019.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.17 : 2,579.70 = 679.98 : x
  2. Step 2: Convert to fraction form
    1,720.17/2,579.70 = 679.98/x
  3. Step 3: Cross multiply
    1,720.17x = 2,579.70 × 679.98
  4. Step 4: Simplify right side
    1,720.17x = 1,754,138.29
  5. Step 5: Solve for x
    x = 1,754,138.29/1,720.17
  6. Step 6: Final answer
    x = 1,019.75

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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.