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Finding the Fourth Proportional to 69,803, 104,723.70 and 20,555

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Solution

The fourth proportional to 69,803, 104,723.70 and 20,555 is: 30,838.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,803 : 104,723.70 = 20,555 : x
  2. Step 2: Convert to fraction form
    69,803/104,723.70 = 20,555/x
  3. Step 3: Cross multiply
    69,803x = 104,723.70 × 20,555
  4. Step 4: Simplify right side
    69,803x = 2,152,595,653.50
  5. Step 5: Solve for x
    x = 2,152,595,653.50/69,803
  6. Step 6: Final answer
    x = 30,838.15

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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.