Home / 2,979.50-4,110.78-1,720.40

Finding the Fourth Proportional to 2,979.50, 4,110.78 and 1,720.40

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Solution

The fourth proportional to 2,979.50, 4,110.78 and 1,720.40 is: 2,373.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,979.50 : 4,110.78 = 1,720.40 : x
  2. Step 2: Convert to fraction form
    2,979.50/4,110.78 = 1,720.40/x
  3. Step 3: Cross multiply
    2,979.50x = 4,110.78 × 1,720.40
  4. Step 4: Simplify right side
    2,979.50x = 7,072,185.91
  5. Step 5: Solve for x
    x = 7,072,185.91/2,979.50
  6. Step 6: Final answer
    x = 2,373.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.