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Finding the Fourth Proportional to 85,584.40, 128,133.60 and 80,929.60

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Solution

The fourth proportional to 85,584.40, 128,133.60 and 80,929.60 is: 121,164.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,584.40 : 128,133.60 = 80,929.60 : x
  2. Step 2: Convert to fraction form
    85,584.40/128,133.60 = 80,929.60/x
  3. Step 3: Cross multiply
    85,584.40x = 128,133.60 × 80,929.60
  4. Step 4: Simplify right side
    85,584.40x = 10,369,800,994.56
  5. Step 5: Solve for x
    x = 10,369,800,994.56/85,584.40
  6. Step 6: Final answer
    x = 121,164.62

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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.