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Finding the Fourth Proportional to 2,990.71, 4,126.67 and 1,664.16

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Solution

The fourth proportional to 2,990.71, 4,126.67 and 1,664.16 is: 2,296.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.71 : 4,126.67 = 1,664.16 : x
  2. Step 2: Convert to fraction form
    2,990.71/4,126.67 = 1,664.16/x
  3. Step 3: Cross multiply
    2,990.71x = 4,126.67 × 1,664.16
  4. Step 4: Simplify right side
    2,990.71x = 6,867,421.59
  5. Step 5: Solve for x
    x = 6,867,421.59/2,990.71
  6. Step 6: Final answer
    x = 2,296.25

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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.