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Finding the Fourth Proportional to 128,666.88, 192,879.36 and 69,413.76

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Solution

The fourth proportional to 128,666.88, 192,879.36 and 69,413.76 is: 104,055.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,666.88 : 192,879.36 = 69,413.76 : x
  2. Step 2: Convert to fraction form
    128,666.88/192,879.36 = 69,413.76/x
  3. Step 3: Cross multiply
    128,666.88x = 192,879.36 × 69,413.76
  4. Step 4: Simplify right side
    128,666.88x = 13,388,481,603.99
  5. Step 5: Solve for x
    x = 13,388,481,603.99/128,666.88
  6. Step 6: Final answer
    x = 104,055.38

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1.5x scale

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.