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Finding the Fourth Proportional to 128,696.64, 192,831.60 and 91,070.28

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Solution

The fourth proportional to 128,696.64, 192,831.60 and 91,070.28 is: 136,454.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,696.64 : 192,831.60 = 91,070.28 : x
  2. Step 2: Convert to fraction form
    128,696.64/192,831.60 = 91,070.28/x
  3. Step 3: Cross multiply
    128,696.64x = 192,831.60 × 91,070.28
  4. Step 4: Simplify right side
    128,696.64x = 17,561,227,804.85
  5. Step 5: Solve for x
    x = 17,561,227,804.85/128,696.64
  6. Step 6: Final answer
    x = 136,454.44

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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.