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Finding the Fourth Proportional to 131,636.80, 197,455.20 and 78,492.70

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Solution

The fourth proportional to 131,636.80, 197,455.20 and 78,492.70 is: 117,739.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,636.80 : 197,455.20 = 78,492.70 : x
  2. Step 2: Convert to fraction form
    131,636.80/197,455.20 = 78,492.70/x
  3. Step 3: Cross multiply
    131,636.80x = 197,455.20 × 78,492.70
  4. Step 4: Simplify right side
    131,636.80x = 15,498,791,777.04
  5. Step 5: Solve for x
    x = 15,498,791,777.04/131,636.80
  6. Step 6: Final answer
    x = 117,739.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.