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Finding the Fourth Proportional to 1,983.95, 2,976.20 and 751.79

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Solution

The fourth proportional to 1,983.95, 2,976.20 and 751.79 is: 1,127.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,983.95 : 2,976.20 = 751.79 : x
  2. Step 2: Convert to fraction form
    1,983.95/2,976.20 = 751.79/x
  3. Step 3: Cross multiply
    1,983.95x = 2,976.20 × 751.79
  4. Step 4: Simplify right side
    1,983.95x = 2,237,473.64
  5. Step 5: Solve for x
    x = 2,237,473.64/1,983.95
  6. Step 6: Final answer
    x = 1,127.79

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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.