Home / 21,742.18-30,000.78-12,181.34

Finding the Fourth Proportional to 21,742.18, 30,000.78 and 12,181.34

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Solution

The fourth proportional to 21,742.18, 30,000.78 and 12,181.34 is: 16,808.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,742.18 : 30,000.78 = 12,181.34 : x
  2. Step 2: Convert to fraction form
    21,742.18/30,000.78 = 12,181.34/x
  3. Step 3: Cross multiply
    21,742.18x = 30,000.78 × 12,181.34
  4. Step 4: Simplify right side
    21,742.18x = 365,449,776.45
  5. Step 5: Solve for x
    x = 365,449,776.45/21,742.18
  6. Step 6: Final answer
    x = 16,808.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.