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Finding the Fourth Proportional to 70,387.56, 105,615.54 and 30,939.57

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Solution

The fourth proportional to 70,387.56, 105,615.54 and 30,939.57 is: 46,424.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,387.56 : 105,615.54 = 30,939.57 : x
  2. Step 2: Convert to fraction form
    70,387.56/105,615.54 = 30,939.57/x
  3. Step 3: Cross multiply
    70,387.56x = 105,615.54 × 30,939.57
  4. Step 4: Simplify right side
    70,387.56x = 3,267,699,392.92
  5. Step 5: Solve for x
    x = 3,267,699,392.92/70,387.56
  6. Step 6: Final answer
    x = 46,424.39

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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.