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Finding the Fourth Proportional to 128,697.64, 192,833.10 and 91,071.28

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Solution

The fourth proportional to 128,697.64, 192,833.10 and 91,071.28 is: 136,455.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,697.64 : 192,833.10 = 91,071.28 : x
  2. Step 2: Convert to fraction form
    128,697.64/192,833.10 = 91,071.28/x
  3. Step 3: Cross multiply
    128,697.64x = 192,833.10 × 91,071.28
  4. Step 4: Simplify right side
    128,697.64x = 17,561,557,243.37
  5. Step 5: Solve for x
    x = 17,561,557,243.37/128,697.64
  6. Step 6: Final answer
    x = 136,455.94

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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.