Home / 20,808.36-31,181.61-12,478.62

Finding the Fourth Proportional to 20,808.36, 31,181.61 and 12,478.62

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Solution

The fourth proportional to 20,808.36, 31,181.61 and 12,478.62 is: 18,699.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.36 : 31,181.61 = 12,478.62 : x
  2. Step 2: Convert to fraction form
    20,808.36/31,181.61 = 12,478.62/x
  3. Step 3: Cross multiply
    20,808.36x = 31,181.61 × 12,478.62
  4. Step 4: Simplify right side
    20,808.36x = 389,103,424.16
  5. Step 5: Solve for x
    x = 389,103,424.16/20,808.36
  6. Step 6: Final answer
    x = 18,699.38

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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.