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Finding the Fourth Proportional to 85,690.80, 128,536.20 and 50,612.40

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Solution

The fourth proportional to 85,690.80, 128,536.20 and 50,612.40 is: 75,918.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,690.80 : 128,536.20 = 50,612.40 : x
  2. Step 2: Convert to fraction form
    85,690.80/128,536.20 = 50,612.40/x
  3. Step 3: Cross multiply
    85,690.80x = 128,536.20 × 50,612.40
  4. Step 4: Simplify right side
    85,690.80x = 6,505,525,568.88
  5. Step 5: Solve for x
    x = 6,505,525,568.88/85,690.80
  6. Step 6: Final answer
    x = 75,918.60

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