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Finding the Fourth Proportional to 137,237.20, 205,855.80 and 128,021.20

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Solution

The fourth proportional to 137,237.20, 205,855.80 and 128,021.20 is: 192,031.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,237.20 : 205,855.80 = 128,021.20 : x
  2. Step 2: Convert to fraction form
    137,237.20/205,855.80 = 128,021.20/x
  3. Step 3: Cross multiply
    137,237.20x = 205,855.80 × 128,021.20
  4. Step 4: Simplify right side
    137,237.20x = 26,353,906,542.96
  5. Step 5: Solve for x
    x = 26,353,906,542.96/137,237.20
  6. Step 6: Final answer
    x = 192,031.80

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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.