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Finding the Fourth Proportional to 1,985.21, 2,976.67 and 751.83

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Solution

The fourth proportional to 1,985.21, 2,976.67 and 751.83 is: 1,127.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.21 : 2,976.67 = 751.83 : x
  2. Step 2: Convert to fraction form
    1,985.21/2,976.67 = 751.83/x
  3. Step 3: Cross multiply
    1,985.21x = 2,976.67 × 751.83
  4. Step 4: Simplify right side
    1,985.21x = 2,237,958.44
  5. Step 5: Solve for x
    x = 2,237,958.44/1,985.21
  6. Step 6: Final answer
    x = 1,127.32

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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.