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Finding the Fourth Proportional to 70,334.12, 105,428.28 and 43,978.34

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Solution

The fourth proportional to 70,334.12, 105,428.28 and 43,978.34 is: 65,921.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,334.12 : 105,428.28 = 43,978.34 : x
  2. Step 2: Convert to fraction form
    70,334.12/105,428.28 = 43,978.34/x
  3. Step 3: Cross multiply
    70,334.12x = 105,428.28 × 43,978.34
  4. Step 4: Simplify right side
    70,334.12x = 4,636,560,743.46
  5. Step 5: Solve for x
    x = 4,636,560,743.46/70,334.12
  6. Step 6: Final answer
    x = 65,921.93

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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.