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Finding the Fourth Proportional to 139,830.74, 192,959.78 and 79,393.45

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Solution

The fourth proportional to 139,830.74, 192,959.78 and 79,393.45 is: 109,559.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,830.74 : 192,959.78 = 79,393.45 : x
  2. Step 2: Convert to fraction form
    139,830.74/192,959.78 = 79,393.45/x
  3. Step 3: Cross multiply
    139,830.74x = 192,959.78 × 79,393.45
  4. Step 4: Simplify right side
    139,830.74x = 15,319,742,645.44
  5. Step 5: Solve for x
    x = 15,319,742,645.44/139,830.74
  6. Step 6: Final answer
    x = 109,559.19

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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.