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Finding the Fourth Proportional to 85,422.40, 128,230.80 and 50,381.80

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Solution

The fourth proportional to 85,422.40, 128,230.80 and 50,381.80 is: 75,630.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,422.40 : 128,230.80 = 50,381.80 : x
  2. Step 2: Convert to fraction form
    85,422.40/128,230.80 = 50,381.80/x
  3. Step 3: Cross multiply
    85,422.40x = 128,230.80 × 50,381.80
  4. Step 4: Simplify right side
    85,422.40x = 6,460,498,519.44
  5. Step 5: Solve for x
    x = 6,460,498,519.44/85,422.40
  6. Step 6: Final answer
    x = 75,630.03

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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.