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Finding the Fourth Proportional to 1,990.81, 2,987.64 and 1,605.47

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Solution

The fourth proportional to 1,990.81, 2,987.64 and 1,605.47 is: 2,409.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.81 : 2,987.64 = 1,605.47 : x
  2. Step 2: Convert to fraction form
    1,990.81/2,987.64 = 1,605.47/x
  3. Step 3: Cross multiply
    1,990.81x = 2,987.64 × 1,605.47
  4. Step 4: Simplify right side
    1,990.81x = 4,796,551.45
  5. Step 5: Solve for x
    x = 4,796,551.45/1,990.81
  6. Step 6: Final answer
    x = 2,409.35

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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.