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Finding the Fourth Proportional to 1,990.41, 2,985.49 and 603.75

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Solution

The fourth proportional to 1,990.41, 2,985.49 and 603.75 is: 905.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.41 : 2,985.49 = 603.75 : x
  2. Step 2: Convert to fraction form
    1,990.41/2,985.49 = 603.75/x
  3. Step 3: Cross multiply
    1,990.41x = 2,985.49 × 603.75
  4. Step 4: Simplify right side
    1,990.41x = 1,802,501.54
  5. Step 5: Solve for x
    x = 1,802,501.54/1,990.41
  6. Step 6: Final answer
    x = 905.59

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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.