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Finding the Fourth Proportional to 128,731.80, 193,097.70 and 76,200.60

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Solution

The fourth proportional to 128,731.80, 193,097.70 and 76,200.60 is: 114,300.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,731.80 : 193,097.70 = 76,200.60 : x
  2. Step 2: Convert to fraction form
    128,731.80/193,097.70 = 76,200.60/x
  3. Step 3: Cross multiply
    128,731.80x = 193,097.70 × 76,200.60
  4. Step 4: Simplify right side
    128,731.80x = 14,714,160,598.62
  5. Step 5: Solve for x
    x = 14,714,160,598.62/128,731.80
  6. Step 6: Final answer
    x = 114,300.90

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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.