Home / 21,820.20-30,116.58-12,864.42

Finding the Fourth Proportional to 21,820.20, 30,116.58 and 12,864.42

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Solution

The fourth proportional to 21,820.20, 30,116.58 and 12,864.42 is: 17,755.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.20 : 30,116.58 = 12,864.42 : x
  2. Step 2: Convert to fraction form
    21,820.20/30,116.58 = 12,864.42/x
  3. Step 3: Cross multiply
    21,820.20x = 30,116.58 × 12,864.42
  4. Step 4: Simplify right side
    21,820.20x = 387,432,334.08
  5. Step 5: Solve for x
    x = 387,432,334.08/21,820.20
  6. Step 6: Final answer
    x = 17,755.67

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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.