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Finding the Fourth Proportional to 128,905.60, 193,358.40 and 69,856.60

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Solution

The fourth proportional to 128,905.60, 193,358.40 and 69,856.60 is: 104,784.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.60 : 193,358.40 = 69,856.60 : x
  2. Step 2: Convert to fraction form
    128,905.60/193,358.40 = 69,856.60/x
  3. Step 3: Cross multiply
    128,905.60x = 193,358.40 × 69,856.60
  4. Step 4: Simplify right side
    128,905.60x = 13,507,360,405.44
  5. Step 5: Solve for x
    x = 13,507,360,405.44/128,905.60
  6. Step 6: Final answer
    x = 104,784.90

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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.