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Finding the Fourth Proportional to 70,072.98, 105,127.46 and 20,156.99

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Solution

The fourth proportional to 70,072.98, 105,127.46 and 20,156.99 is: 30,240.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,072.98 : 105,127.46 = 20,156.99 : x
  2. Step 2: Convert to fraction form
    70,072.98/105,127.46 = 20,156.99/x
  3. Step 3: Cross multiply
    70,072.98x = 105,127.46 × 20,156.99
  4. Step 4: Simplify right side
    70,072.98x = 2,119,052,533.52
  5. Step 5: Solve for x
    x = 2,119,052,533.52/70,072.98
  6. Step 6: Final answer
    x = 30,240.65

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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.