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Finding the Fourth Proportional to 139,690.71, 192,751.74 and 78,440.06

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Solution

The fourth proportional to 139,690.71, 192,751.74 and 78,440.06 is: 108,235.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,690.71 : 192,751.74 = 78,440.06 : x
  2. Step 2: Convert to fraction form
    139,690.71/192,751.74 = 78,440.06/x
  3. Step 3: Cross multiply
    139,690.71x = 192,751.74 × 78,440.06
  4. Step 4: Simplify right side
    139,690.71x = 15,119,458,532.58
  5. Step 5: Solve for x
    x = 15,119,458,532.58/139,690.71
  6. Step 6: Final answer
    x = 108,235.25

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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.