Home / 2,979.61-4,111.79-1,720.65

Finding the Fourth Proportional to 2,979.61, 4,111.79 and 1,720.65

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Solution

The fourth proportional to 2,979.61, 4,111.79 and 1,720.65 is: 2,374.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,979.61 : 4,111.79 = 1,720.65 : x
  2. Step 2: Convert to fraction form
    2,979.61/4,111.79 = 1,720.65/x
  3. Step 3: Cross multiply
    2,979.61x = 4,111.79 × 1,720.65
  4. Step 4: Simplify right side
    2,979.61x = 7,074,942.86
  5. Step 5: Solve for x
    x = 7,074,942.86/2,979.61
  6. Step 6: Final answer
    x = 2,374.45

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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.