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Finding the Fourth Proportional to 2,990.97, 4,127.49 and 1,664.78

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Solution

The fourth proportional to 2,990.97, 4,127.49 and 1,664.78 is: 2,297.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.97 : 4,127.49 = 1,664.78 : x
  2. Step 2: Convert to fraction form
    2,990.97/4,127.49 = 1,664.78/x
  3. Step 3: Cross multiply
    2,990.97x = 4,127.49 × 1,664.78
  4. Step 4: Simplify right side
    2,990.97x = 6,871,342.16
  5. Step 5: Solve for x
    x = 6,871,342.16/2,990.97
  6. Step 6: Final answer
    x = 2,297.36

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1.5x scale

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.