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Finding the Fourth Proportional to 70,400.86, 105,338.82 and 69,613.54

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Solution

The fourth proportional to 70,400.86, 105,338.82 and 69,613.54 is: 104,160.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,400.86 : 105,338.82 = 69,613.54 : x
  2. Step 2: Convert to fraction form
    70,400.86/105,338.82 = 69,613.54/x
  3. Step 3: Cross multiply
    70,400.86x = 105,338.82 × 69,613.54
  4. Step 4: Simplify right side
    70,400.86x = 7,333,008,159.62
  5. Step 5: Solve for x
    x = 7,333,008,159.62/70,400.86
  6. Step 6: Final answer
    x = 104,160.78

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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.