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Finding the Fourth Proportional to 136,709.52, 205,355.72 and 128,719.60

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Solution

The fourth proportional to 136,709.52, 205,355.72 and 128,719.60 is: 193,353.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,709.52 : 205,355.72 = 128,719.60 : x
  2. Step 2: Convert to fraction form
    136,709.52/205,355.72 = 128,719.60/x
  3. Step 3: Cross multiply
    136,709.52x = 205,355.72 × 128,719.60
  4. Step 4: Simplify right side
    136,709.52x = 26,433,306,136.11
  5. Step 5: Solve for x
    x = 26,433,306,136.11/136,709.52
  6. Step 6: Final answer
    x = 193,353.81

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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.