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Finding the Fourth Proportional to 20,485.80, 30,728.70 and 17,205.30

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Solution

The fourth proportional to 20,485.80, 30,728.70 and 17,205.30 is: 25,807.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.80 : 30,728.70 = 17,205.30 : x
  2. Step 2: Convert to fraction form
    20,485.80/30,728.70 = 17,205.30/x
  3. Step 3: Cross multiply
    20,485.80x = 30,728.70 × 17,205.30
  4. Step 4: Simplify right side
    20,485.80x = 528,696,502.11
  5. Step 5: Solve for x
    x = 528,696,502.11/20,485.80
  6. Step 6: Final answer
    x = 25,807.95

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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.