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Finding the Fourth Proportional to 70,202.61, 105,288.42 and 20,271.84

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Solution

The fourth proportional to 70,202.61, 105,288.42 and 20,271.84 is: 30,403.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,202.61 : 105,288.42 = 20,271.84 : x
  2. Step 2: Convert to fraction form
    70,202.61/105,288.42 = 20,271.84/x
  3. Step 3: Cross multiply
    70,202.61x = 105,288.42 × 20,271.84
  4. Step 4: Simplify right side
    70,202.61x = 2,134,390,004.09
  5. Step 5: Solve for x
    x = 2,134,390,004.09/70,202.61
  6. Step 6: Final answer
    x = 30,403.29

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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.