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Finding the Fourth Proportional to 39,028.80, 58,456.80 and 15,643.20

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Solution

The fourth proportional to 39,028.80, 58,456.80 and 15,643.20 is: 23,430.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,028.80 : 58,456.80 = 15,643.20 : x
  2. Step 2: Convert to fraction form
    39,028.80/58,456.80 = 15,643.20/x
  3. Step 3: Cross multiply
    39,028.80x = 58,456.80 × 15,643.20
  4. Step 4: Simplify right side
    39,028.80x = 914,451,413.76
  5. Step 5: Solve for x
    x = 914,451,413.76/39,028.80
  6. Step 6: Final answer
    x = 23,430.17

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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.