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Finding the Fourth Proportional to 128,455.20, 192,682.80 and 89,056.80

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Solution

The fourth proportional to 128,455.20, 192,682.80 and 89,056.80 is: 133,585.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,455.20 : 192,682.80 = 89,056.80 : x
  2. Step 2: Convert to fraction form
    128,455.20/192,682.80 = 89,056.80/x
  3. Step 3: Cross multiply
    128,455.20x = 192,682.80 × 89,056.80
  4. Step 4: Simplify right side
    128,455.20x = 17,159,713,583.04
  5. Step 5: Solve for x
    x = 17,159,713,583.04/128,455.20
  6. Step 6: Final answer
    x = 133,585.20

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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.