Home / 20,858.20-31,287.30-8,384.20

Finding the Fourth Proportional to 20,858.20, 31,287.30 and 8,384.20

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Solution

The fourth proportional to 20,858.20, 31,287.30 and 8,384.20 is: 12,576.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.20 : 31,287.30 = 8,384.20 : x
  2. Step 2: Convert to fraction form
    20,858.20/31,287.30 = 8,384.20/x
  3. Step 3: Cross multiply
    20,858.20x = 31,287.30 × 8,384.20
  4. Step 4: Simplify right side
    20,858.20x = 262,318,980.66
  5. Step 5: Solve for x
    x = 262,318,980.66/20,858.20
  6. Step 6: Final answer
    x = 12,576.30

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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.