Home / 20,971.54-31,458.93-8,485.66

Finding the Fourth Proportional to 20,971.54, 31,458.93 and 8,485.66

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Solution

The fourth proportional to 20,971.54, 31,458.93 and 8,485.66 is: 12,729.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.54 : 31,458.93 = 8,485.66 : x
  2. Step 2: Convert to fraction form
    20,971.54/31,458.93 = 8,485.66/x
  3. Step 3: Cross multiply
    20,971.54x = 31,458.93 × 8,485.66
  4. Step 4: Simplify right side
    20,971.54x = 266,949,783.94
  5. Step 5: Solve for x
    x = 266,949,783.94/20,971.54
  6. Step 6: Final answer
    x = 12,729.15

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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.