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Finding the Fourth Proportional to 1,991.66, 2,988.47 and 1,410.40

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Solution

The fourth proportional to 1,991.66, 2,988.47 and 1,410.40 is: 2,116.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.66 : 2,988.47 = 1,410.40 : x
  2. Step 2: Convert to fraction form
    1,991.66/2,988.47 = 1,410.40/x
  3. Step 3: Cross multiply
    1,991.66x = 2,988.47 × 1,410.40
  4. Step 4: Simplify right side
    1,991.66x = 4,214,940.06
  5. Step 5: Solve for x
    x = 4,214,940.06/1,991.66
  6. Step 6: Final answer
    x = 2,116.30

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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.