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Finding the Fourth Proportional to 139,397.98, 192,373.32 and 78,977.20

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Solution

The fourth proportional to 139,397.98, 192,373.32 and 78,977.20 is: 108,990.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,397.98 : 192,373.32 = 78,977.20 : x
  2. Step 2: Convert to fraction form
    139,397.98/192,373.32 = 78,977.20/x
  3. Step 3: Cross multiply
    139,397.98x = 192,373.32 × 78,977.20
  4. Step 4: Simplify right side
    139,397.98x = 15,193,106,168.30
  5. Step 5: Solve for x
    x = 15,193,106,168.30/139,397.98
  6. Step 6: Final answer
    x = 108,990.86

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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.