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Finding the Fourth Proportional to 1,970.78, 2,720.23 and 1,381.46

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Solution

The fourth proportional to 1,970.78, 2,720.23 and 1,381.46 is: 1,906.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,970.78 : 2,720.23 = 1,381.46 : x
  2. Step 2: Convert to fraction form
    1,970.78/2,720.23 = 1,381.46/x
  3. Step 3: Cross multiply
    1,970.78x = 2,720.23 × 1,381.46
  4. Step 4: Simplify right side
    1,970.78x = 3,757,871.88
  5. Step 5: Solve for x
    x = 3,757,871.88/1,970.78
  6. Step 6: Final answer
    x = 1,906.80

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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.