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Finding the Fourth Proportional to 128,806, 177,718.64 and 74,344.84

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Solution

The fourth proportional to 128,806, 177,718.64 and 74,344.84 is: 102,576.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,806 : 177,718.64 = 74,344.84 : x
  2. Step 2: Convert to fraction form
    128,806/177,718.64 = 74,344.84/x
  3. Step 3: Cross multiply
    128,806x = 177,718.64 × 74,344.84
  4. Step 4: Simplify right side
    128,806x = 13,212,463,855.82
  5. Step 5: Solve for x
    x = 13,212,463,855.82/128,806
  6. Step 6: Final answer
    x = 102,576.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.