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Finding the Fourth Proportional to 128,999.20, 193,239.60 and 73,530.40

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Solution

The fourth proportional to 128,999.20, 193,239.60 and 73,530.40 is: 110,147.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,999.20 : 193,239.60 = 73,530.40 : x
  2. Step 2: Convert to fraction form
    128,999.20/193,239.60 = 73,530.40/x
  3. Step 3: Cross multiply
    128,999.20x = 193,239.60 × 73,530.40
  4. Step 4: Simplify right side
    128,999.20x = 14,208,985,083.84
  5. Step 5: Solve for x
    x = 14,208,985,083.84/128,999.20
  6. Step 6: Final answer
    x = 110,147.85

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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.