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Finding the Fourth Proportional to 2,127.80, 3,191.91 and 666.98

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Solution

The fourth proportional to 2,127.80, 3,191.91 and 666.98 is: 1,000.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,127.80 : 3,191.91 = 666.98 : x
  2. Step 2: Convert to fraction form
    2,127.80/3,191.91 = 666.98/x
  3. Step 3: Cross multiply
    2,127.80x = 3,191.91 × 666.98
  4. Step 4: Simplify right side
    2,127.80x = 2,128,940.13
  5. Step 5: Solve for x
    x = 2,128,940.13/2,127.80
  6. Step 6: Final answer
    x = 1,000.54

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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.