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Finding the Fourth Proportional to 128,648.60, 192,980.48 and 49,763.24

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Solution

The fourth proportional to 128,648.60, 192,980.48 and 49,763.24 is: 74,647.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,648.60 : 192,980.48 = 49,763.24 : x
  2. Step 2: Convert to fraction form
    128,648.60/192,980.48 = 49,763.24/x
  3. Step 3: Cross multiply
    128,648.60x = 192,980.48 × 49,763.24
  4. Step 4: Simplify right side
    128,648.60x = 9,603,333,941.56
  5. Step 5: Solve for x
    x = 9,603,333,941.56/128,648.60
  6. Step 6: Final answer
    x = 74,647.79

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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.