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Finding the Fourth Proportional to 20,615.99, 28,450.76 and 12,117.99

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Solution

The fourth proportional to 20,615.99, 28,450.76 and 12,117.99 is: 16,723.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.99 : 28,450.76 = 12,117.99 : x
  2. Step 2: Convert to fraction form
    20,615.99/28,450.76 = 12,117.99/x
  3. Step 3: Cross multiply
    20,615.99x = 28,450.76 × 12,117.99
  4. Step 4: Simplify right side
    20,615.99x = 344,765,964.58
  5. Step 5: Solve for x
    x = 344,765,964.58/20,615.99
  6. Step 6: Final answer
    x = 16,723.24

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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.