Home / 13,820.13-20,705.37-8,400.63

Finding the Fourth Proportional to 13,820.13, 20,705.37 and 8,400.63

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Solution

The fourth proportional to 13,820.13, 20,705.37 and 8,400.63 is: 12,585.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,820.13 : 20,705.37 = 8,400.63 : x
  2. Step 2: Convert to fraction form
    13,820.13/20,705.37 = 8,400.63/x
  3. Step 3: Cross multiply
    13,820.13x = 20,705.37 × 8,400.63
  4. Step 4: Simplify right side
    13,820.13x = 173,938,152.38
  5. Step 5: Solve for x
    x = 173,938,152.38/13,820.13
  6. Step 6: Final answer
    x = 12,585.86

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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.