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Finding the Fourth Proportional to 3,645.78, 5,031.21 and 1,989.78

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Solution

The fourth proportional to 3,645.78, 5,031.21 and 1,989.78 is: 2,745.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,645.78 : 5,031.21 = 1,989.78 : x
  2. Step 2: Convert to fraction form
    3,645.78/5,031.21 = 1,989.78/x
  3. Step 3: Cross multiply
    3,645.78x = 5,031.21 × 1,989.78
  4. Step 4: Simplify right side
    3,645.78x = 10,011,001.03
  5. Step 5: Solve for x
    x = 10,011,001.03/3,645.78
  6. Step 6: Final answer
    x = 2,745.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.