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Finding the Fourth Proportional to 20,987.99, 31,474.42 and 6,945.42

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Solution

The fourth proportional to 20,987.99, 31,474.42 and 6,945.42 is: 10,415.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.99 : 31,474.42 = 6,945.42 : x
  2. Step 2: Convert to fraction form
    20,987.99/31,474.42 = 6,945.42/x
  3. Step 3: Cross multiply
    20,987.99x = 31,474.42 × 6,945.42
  4. Step 4: Simplify right side
    20,987.99x = 218,603,066.16
  5. Step 5: Solve for x
    x = 218,603,066.16/20,987.99
  6. Step 6: Final answer
    x = 10,415.63

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1.5x scale

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.