Home / 12,821.21-17,680.30-8,572.22

Finding the Fourth Proportional to 12,821.21, 17,680.30 and 8,572.22

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Solution

The fourth proportional to 12,821.21, 17,680.30 and 8,572.22 is: 11,820.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,821.21 : 17,680.30 = 8,572.22 : x
  2. Step 2: Convert to fraction form
    12,821.21/17,680.30 = 8,572.22/x
  3. Step 3: Cross multiply
    12,821.21x = 17,680.30 × 8,572.22
  4. Step 4: Simplify right side
    12,821.21x = 151,559,421.27
  5. Step 5: Solve for x
    x = 151,559,421.27/12,821.21
  6. Step 6: Final answer
    x = 11,820.99

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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.