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Finding the Fourth Proportional to 139,840.74, 192,988.37 and 105,323.67

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Solution

The fourth proportional to 139,840.74, 192,988.37 and 105,323.67 is: 145,352.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,840.74 : 192,988.37 = 105,323.67 : x
  2. Step 2: Convert to fraction form
    139,840.74/192,988.37 = 105,323.67/x
  3. Step 3: Cross multiply
    139,840.74x = 192,988.37 × 105,323.67
  4. Step 4: Simplify right side
    139,840.74x = 20,326,243,659.03
  5. Step 5: Solve for x
    x = 20,326,243,659.03/139,840.74
  6. Step 6: Final answer
    x = 145,352.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.