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Finding the Fourth Proportional to 203,559.60, 305,339.40 and 128,764.20

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Solution

The fourth proportional to 203,559.60, 305,339.40 and 128,764.20 is: 193,146.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,559.60 : 305,339.40 = 128,764.20 : x
  2. Step 2: Convert to fraction form
    203,559.60/305,339.40 = 128,764.20/x
  3. Step 3: Cross multiply
    203,559.60x = 305,339.40 × 128,764.20
  4. Step 4: Simplify right side
    203,559.60x = 39,316,783,569.48
  5. Step 5: Solve for x
    x = 39,316,783,569.48/203,559.60
  6. Step 6: Final answer
    x = 193,146.30

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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.