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Finding the Fourth Proportional to 70,011.54, 105,000.30 and 20,079.90

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Solution

The fourth proportional to 70,011.54, 105,000.30 and 20,079.90 is: 30,114.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,011.54 : 105,000.30 = 20,079.90 : x
  2. Step 2: Convert to fraction form
    70,011.54/105,000.30 = 20,079.90/x
  3. Step 3: Cross multiply
    70,011.54x = 105,000.30 × 20,079.90
  4. Step 4: Simplify right side
    70,011.54x = 2,108,395,523.97
  5. Step 5: Solve for x
    x = 2,108,395,523.97/70,011.54
  6. Step 6: Final answer
    x = 30,114.97

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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.