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Finding the Fourth Proportional to 85,412.40, 128,215.80 and 50,371.80

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Solution

The fourth proportional to 85,412.40, 128,215.80 and 50,371.80 is: 75,615.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,412.40 : 128,215.80 = 50,371.80 : x
  2. Step 2: Convert to fraction form
    85,412.40/128,215.80 = 50,371.80/x
  3. Step 3: Cross multiply
    85,412.40x = 128,215.80 × 50,371.80
  4. Step 4: Simplify right side
    85,412.40x = 6,458,460,634.44
  5. Step 5: Solve for x
    x = 6,458,460,634.44/85,412.40
  6. Step 6: Final answer
    x = 75,615.02

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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.