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Finding the Fourth Proportional to 128,321.52, 192,515.08 and 53,416.76

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Solution

The fourth proportional to 128,321.52, 192,515.08 and 53,416.76 is: 80,138.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,321.52 : 192,515.08 = 53,416.76 : x
  2. Step 2: Convert to fraction form
    128,321.52/192,515.08 = 53,416.76/x
  3. Step 3: Cross multiply
    128,321.52x = 192,515.08 × 53,416.76
  4. Step 4: Simplify right side
    128,321.52x = 10,283,531,824.74
  5. Step 5: Solve for x
    x = 10,283,531,824.74/128,321.52
  6. Step 6: Final answer
    x = 80,138.79

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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.