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Finding the Fourth Proportional to 128,453.42, 192,719.02 and 91,085.70

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Solution

The fourth proportional to 128,453.42, 192,719.02 and 91,085.70 is: 136,656.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,453.42 : 192,719.02 = 91,085.70 : x
  2. Step 2: Convert to fraction form
    128,453.42/192,719.02 = 91,085.70/x
  3. Step 3: Cross multiply
    128,453.42x = 192,719.02 × 91,085.70
  4. Step 4: Simplify right side
    128,453.42x = 17,553,946,840.01
  5. Step 5: Solve for x
    x = 17,553,946,840.01/128,453.42
  6. Step 6: Final answer
    x = 136,656.13

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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.