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Finding the Fourth Proportional to 128,838.56, 193,263.90 and 106,307.46

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Solution

The fourth proportional to 128,838.56, 193,263.90 and 106,307.46 is: 159,466.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,838.56 : 193,263.90 = 106,307.46 : x
  2. Step 2: Convert to fraction form
    128,838.56/193,263.90 = 106,307.46/x
  3. Step 3: Cross multiply
    128,838.56x = 193,263.90 × 106,307.46
  4. Step 4: Simplify right side
    128,838.56x = 20,545,394,318.69
  5. Step 5: Solve for x
    x = 20,545,394,318.69/128,838.56
  6. Step 6: Final answer
    x = 159,466.19

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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.