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Finding the Fourth Proportional to 70,134.62, 105,208.95 and 20,215.94

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Solution

The fourth proportional to 70,134.62, 105,208.95 and 20,215.94 is: 30,325.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,134.62 : 105,208.95 = 20,215.94 : x
  2. Step 2: Convert to fraction form
    70,134.62/105,208.95 = 20,215.94/x
  3. Step 3: Cross multiply
    70,134.62x = 105,208.95 × 20,215.94
  4. Step 4: Simplify right side
    70,134.62x = 2,126,897,820.66
  5. Step 5: Solve for x
    x = 2,126,897,820.66/70,134.62
  6. Step 6: Final answer
    x = 30,325.93

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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.