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Finding the Fourth Proportional to 2,652.13, 3,978.80 and 920.75

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Solution

The fourth proportional to 2,652.13, 3,978.80 and 920.75 is: 1,381.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,652.13 : 3,978.80 = 920.75 : x
  2. Step 2: Convert to fraction form
    2,652.13/3,978.80 = 920.75/x
  3. Step 3: Cross multiply
    2,652.13x = 3,978.80 × 920.75
  4. Step 4: Simplify right side
    2,652.13x = 3,663,480.10
  5. Step 5: Solve for x
    x = 3,663,480.10/2,652.13
  6. Step 6: Final answer
    x = 1,381.34

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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.