Home / 20,970.20-31,413.75-13,579.85

Finding the Fourth Proportional to 20,970.20, 31,413.75 and 13,579.85

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Solution

The fourth proportional to 20,970.20, 31,413.75 and 13,579.85 is: 20,342.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.20 : 31,413.75 = 13,579.85 : x
  2. Step 2: Convert to fraction form
    20,970.20/31,413.75 = 13,579.85/x
  3. Step 3: Cross multiply
    20,970.20x = 31,413.75 × 13,579.85
  4. Step 4: Simplify right side
    20,970.20x = 426,593,855.87
  5. Step 5: Solve for x
    x = 426,593,855.87/20,970.20
  6. Step 6: Final answer
    x = 20,342.87

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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.