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Finding the Fourth Proportional to 1,990.41, 2,980.75 and 1,718.25

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Solution

The fourth proportional to 1,990.41, 2,980.75 and 1,718.25 is: 2,573.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.41 : 2,980.75 = 1,718.25 : x
  2. Step 2: Convert to fraction form
    1,990.41/2,980.75 = 1,718.25/x
  3. Step 3: Cross multiply
    1,990.41x = 2,980.75 × 1,718.25
  4. Step 4: Simplify right side
    1,990.41x = 5,121,658.78
  5. Step 5: Solve for x
    x = 5,121,658.78/1,990.41
  6. Step 6: Final answer
    x = 2,573.17

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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.