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Finding the Fourth Proportional to 128,703.54, 193,121.37 and 61,311.90

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Solution

The fourth proportional to 128,703.54, 193,121.37 and 61,311.90 is: 91,999.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,703.54 : 193,121.37 = 61,311.90 : x
  2. Step 2: Convert to fraction form
    128,703.54/193,121.37 = 61,311.90/x
  3. Step 3: Cross multiply
    128,703.54x = 193,121.37 × 61,311.90
  4. Step 4: Simplify right side
    128,703.54x = 11,840,638,125.30
  5. Step 5: Solve for x
    x = 11,840,638,125.30/128,703.54
  6. Step 6: Final answer
    x = 91,999.32

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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.