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Finding the Fourth Proportional to 131,415.60, 197,123.40 and 81,811.20

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Solution

The fourth proportional to 131,415.60, 197,123.40 and 81,811.20 is: 122,716.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,415.60 : 197,123.40 = 81,811.20 : x
  2. Step 2: Convert to fraction form
    131,415.60/197,123.40 = 81,811.20/x
  3. Step 3: Cross multiply
    131,415.60x = 197,123.40 × 81,811.20
  4. Step 4: Simplify right side
    131,415.60x = 16,126,901,902.08
  5. Step 5: Solve for x
    x = 16,126,901,902.08/131,415.60
  6. Step 6: Final answer
    x = 122,716.80

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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.