Home / 20,858.18-31,287.25-8,378.21

Finding the Fourth Proportional to 20,858.18, 31,287.25 and 8,378.21

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Solution

The fourth proportional to 20,858.18, 31,287.25 and 8,378.21 is: 12,567.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.18 : 31,287.25 = 8,378.21 : x
  2. Step 2: Convert to fraction form
    20,858.18/31,287.25 = 8,378.21/x
  3. Step 3: Cross multiply
    20,858.18x = 31,287.25 × 8,378.21
  4. Step 4: Simplify right side
    20,858.18x = 262,130,973.44
  5. Step 5: Solve for x
    x = 262,130,973.44/20,858.18
  6. Step 6: Final answer
    x = 12,567.30

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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.