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Finding the Fourth Proportional to 131,659.70, 197,489.55 and 78,515.60

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Solution

The fourth proportional to 131,659.70, 197,489.55 and 78,515.60 is: 117,773.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,659.70 : 197,489.55 = 78,515.60 : x
  2. Step 2: Convert to fraction form
    131,659.70/197,489.55 = 78,515.60/x
  3. Step 3: Cross multiply
    131,659.70x = 197,489.55 × 78,515.60
  4. Step 4: Simplify right side
    131,659.70x = 15,506,010,511.98
  5. Step 5: Solve for x
    x = 15,506,010,511.98/131,659.70
  6. Step 6: Final answer
    x = 117,773.40

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1.5x scale

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.