Home / 20,985.90-31,478.85-6,942.15

Finding the Fourth Proportional to 20,985.90, 31,478.85 and 6,942.15

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Solution

The fourth proportional to 20,985.90, 31,478.85 and 6,942.15 is: 10,413.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.90 : 31,478.85 = 6,942.15 : x
  2. Step 2: Convert to fraction form
    20,985.90/31,478.85 = 6,942.15/x
  3. Step 3: Cross multiply
    20,985.90x = 31,478.85 × 6,942.15
  4. Step 4: Simplify right side
    20,985.90x = 218,530,898.53
  5. Step 5: Solve for x
    x = 218,530,898.53/20,985.90
  6. Step 6: Final answer
    x = 10,413.23

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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.