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Finding the Fourth Proportional to 86,919.20, 130,378.80 and 85,169.60

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Solution

The fourth proportional to 86,919.20, 130,378.80 and 85,169.60 is: 127,754.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,919.20 : 130,378.80 = 85,169.60 : x
  2. Step 2: Convert to fraction form
    86,919.20/130,378.80 = 85,169.60/x
  3. Step 3: Cross multiply
    86,919.20x = 130,378.80 × 85,169.60
  4. Step 4: Simplify right side
    86,919.20x = 11,104,310,244.48
  5. Step 5: Solve for x
    x = 11,104,310,244.48/86,919.20
  6. Step 6: Final answer
    x = 127,754.40

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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.