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Finding the Fourth Proportional to 128,921.61, 193,440.44 and 69,687.93

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Solution

The fourth proportional to 128,921.61, 193,440.44 and 69,687.93 is: 104,563.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.61 : 193,440.44 = 69,687.93 : x
  2. Step 2: Convert to fraction form
    128,921.61/193,440.44 = 69,687.93/x
  3. Step 3: Cross multiply
    128,921.61x = 193,440.44 × 69,687.93
  4. Step 4: Simplify right side
    128,921.61x = 13,480,463,841.89
  5. Step 5: Solve for x
    x = 13,480,463,841.89/128,921.61
  6. Step 6: Final answer
    x = 104,563.26

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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.