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Finding the Fourth Proportional to 20,485.08, 30,728.20 and 5,695.08

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Solution

The fourth proportional to 20,485.08, 30,728.20 and 5,695.08 is: 8,542.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.08 : 30,728.20 = 5,695.08 : x
  2. Step 2: Convert to fraction form
    20,485.08/30,728.20 = 5,695.08/x
  3. Step 3: Cross multiply
    20,485.08x = 30,728.20 × 5,695.08
  4. Step 4: Simplify right side
    20,485.08x = 174,999,557.26
  5. Step 5: Solve for x
    x = 174,999,557.26/20,485.08
  6. Step 6: Final answer
    x = 8,542.78

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1.5x scale

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.