Home / 20,720.34-31,066.74-12,379.50

Finding the Fourth Proportional to 20,720.34, 31,066.74 and 12,379.50

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Solution

The fourth proportional to 20,720.34, 31,066.74 and 12,379.50 is: 18,561.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.34 : 31,066.74 = 12,379.50 : x
  2. Step 2: Convert to fraction form
    20,720.34/31,066.74 = 12,379.50/x
  3. Step 3: Cross multiply
    20,720.34x = 31,066.74 × 12,379.50
  4. Step 4: Simplify right side
    20,720.34x = 384,590,707.83
  5. Step 5: Solve for x
    x = 384,590,707.83/20,720.34
  6. Step 6: Final answer
    x = 18,561.02

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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.