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Finding the Fourth Proportional to 139,325.44, 192,271.40 and 78,894.50

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Solution

The fourth proportional to 139,325.44, 192,271.40 and 78,894.50 is: 108,875.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,325.44 : 192,271.40 = 78,894.50 : x
  2. Step 2: Convert to fraction form
    139,325.44/192,271.40 = 78,894.50/x
  3. Step 3: Cross multiply
    139,325.44x = 192,271.40 × 78,894.50
  4. Step 4: Simplify right side
    139,325.44x = 15,169,155,967.30
  5. Step 5: Solve for x
    x = 15,169,155,967.30/139,325.44
  6. Step 6: Final answer
    x = 108,875.71

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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.