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Finding the Fourth Proportional to 139,603.20, 209,404.80 and 55,383.45

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Solution

The fourth proportional to 139,603.20, 209,404.80 and 55,383.45 is: 83,075.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,603.20 : 209,404.80 = 55,383.45 : x
  2. Step 2: Convert to fraction form
    139,603.20/209,404.80 = 55,383.45/x
  3. Step 3: Cross multiply
    139,603.20x = 209,404.80 × 55,383.45
  4. Step 4: Simplify right side
    139,603.20x = 11,597,560,270.56
  5. Step 5: Solve for x
    x = 11,597,560,270.56/139,603.20
  6. Step 6: Final answer
    x = 83,075.18

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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.