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Finding the Fourth Proportional to 20,258.64, 27,978.48 and 15,426.90

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Solution

The fourth proportional to 20,258.64, 27,978.48 and 15,426.90 is: 21,305.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,258.64 : 27,978.48 = 15,426.90 : x
  2. Step 2: Convert to fraction form
    20,258.64/27,978.48 = 15,426.90/x
  3. Step 3: Cross multiply
    20,258.64x = 27,978.48 × 15,426.90
  4. Step 4: Simplify right side
    20,258.64x = 431,621,213.11
  5. Step 5: Solve for x
    x = 431,621,213.11/20,258.64
  6. Step 6: Final answer
    x = 21,305.54

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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.