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Finding the Fourth Proportional to 2,127.70, 3,191.55 and 666.85

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Solution

The fourth proportional to 2,127.70, 3,191.55 and 666.85 is: 1,000.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,127.70 : 3,191.55 = 666.85 : x
  2. Step 2: Convert to fraction form
    2,127.70/3,191.55 = 666.85/x
  3. Step 3: Cross multiply
    2,127.70x = 3,191.55 × 666.85
  4. Step 4: Simplify right side
    2,127.70x = 2,128,285.12
  5. Step 5: Solve for x
    x = 2,128,285.12/2,127.70
  6. Step 6: Final answer
    x = 1,000.28

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1.5x scale

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.