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Finding the Fourth Proportional to 192,690.40, 288,949.20 and 87,455.20

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Solution

The fourth proportional to 192,690.40, 288,949.20 and 87,455.20 is: 131,143.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,690.40 : 288,949.20 = 87,455.20 : x
  2. Step 2: Convert to fraction form
    192,690.40/288,949.20 = 87,455.20/x
  3. Step 3: Cross multiply
    192,690.40x = 288,949.20 × 87,455.20
  4. Step 4: Simplify right side
    192,690.40x = 25,270,110,075.84
  5. Step 5: Solve for x
    x = 25,270,110,075.84/192,690.40
  6. Step 6: Final answer
    x = 131,143.59

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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.