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Finding the Fourth Proportional to 139,670.78, 192,749.74 and 76,012.70

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Solution

The fourth proportional to 139,670.78, 192,749.74 and 76,012.70 is: 104,899.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,670.78 : 192,749.74 = 76,012.70 : x
  2. Step 2: Convert to fraction form
    139,670.78/192,749.74 = 76,012.70/x
  3. Step 3: Cross multiply
    139,670.78x = 192,749.74 × 76,012.70
  4. Step 4: Simplify right side
    139,670.78x = 14,651,428,161.70
  5. Step 5: Solve for x
    x = 14,651,428,161.70/139,670.78
  6. Step 6: Final answer
    x = 104,899.74

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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.