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Finding the Fourth Proportional to 70,429.96, 105,690.72 and 30,487.89

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Solution

The fourth proportional to 70,429.96, 105,690.72 and 30,487.89 is: 45,751.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,429.96 : 105,690.72 = 30,487.89 : x
  2. Step 2: Convert to fraction form
    70,429.96/105,690.72 = 30,487.89/x
  3. Step 3: Cross multiply
    70,429.96x = 105,690.72 × 30,487.89
  4. Step 4: Simplify right side
    70,429.96x = 3,222,287,556.05
  5. Step 5: Solve for x
    x = 3,222,287,556.05/70,429.96
  6. Step 6: Final answer
    x = 45,751.66

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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.