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Finding the Fourth Proportional to 1,990.29, 2,985.04 and 1,891.50

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Solution

The fourth proportional to 1,990.29, 2,985.04 and 1,891.50 is: 2,836.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.29 : 2,985.04 = 1,891.50 : x
  2. Step 2: Convert to fraction form
    1,990.29/2,985.04 = 1,891.50/x
  3. Step 3: Cross multiply
    1,990.29x = 2,985.04 × 1,891.50
  4. Step 4: Simplify right side
    1,990.29x = 5,646,210.62
  5. Step 5: Solve for x
    x = 5,646,210.62/1,990.29
  6. Step 6: Final answer
    x = 2,836.89

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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.