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Finding the Fourth Proportional to 2,101.11, 3,152.07 and 640.48

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Solution

The fourth proportional to 2,101.11, 3,152.07 and 640.48 is: 960.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.11 : 3,152.07 = 640.48 : x
  2. Step 2: Convert to fraction form
    2,101.11/3,152.07 = 640.48/x
  3. Step 3: Cross multiply
    2,101.11x = 3,152.07 × 640.48
  4. Step 4: Simplify right side
    2,101.11x = 2,018,837.79
  5. Step 5: Solve for x
    x = 2,018,837.79/2,101.11
  6. Step 6: Final answer
    x = 960.84

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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.