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Finding the Fourth Proportional to 1,990.63, 2,985.03 and 603.65

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Solution

The fourth proportional to 1,990.63, 2,985.03 and 603.65 is: 905.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.63 : 2,985.03 = 603.65 : x
  2. Step 2: Convert to fraction form
    1,990.63/2,985.03 = 603.65/x
  3. Step 3: Cross multiply
    1,990.63x = 2,985.03 × 603.65
  4. Step 4: Simplify right side
    1,990.63x = 1,801,919.12
  5. Step 5: Solve for x
    x = 1,801,919.12/1,990.63
  6. Step 6: Final answer
    x = 905.20

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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.