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Finding the Fourth Proportional to 85,986.32, 128,919 and 33,351.44

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Solution

The fourth proportional to 85,986.32, 128,919 and 33,351.44 is: 50,003.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,986.32 : 128,919 = 33,351.44 : x
  2. Step 2: Convert to fraction form
    85,986.32/128,919 = 33,351.44/x
  3. Step 3: Cross multiply
    85,986.32x = 128,919 × 33,351.44
  4. Step 4: Simplify right side
    85,986.32x = 4,299,634,293.36
  5. Step 5: Solve for x
    x = 4,299,634,293.36/85,986.32
  6. Step 6: Final answer
    x = 50,003.70

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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.