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Finding the Fourth Proportional to 20,705.99, 28,573.49 and 12,653.11

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Solution

The fourth proportional to 20,705.99, 28,573.49 and 12,653.11 is: 17,460.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,705.99 : 28,573.49 = 12,653.11 : x
  2. Step 2: Convert to fraction form
    20,705.99/28,573.49 = 12,653.11/x
  3. Step 3: Cross multiply
    20,705.99x = 28,573.49 × 12,653.11
  4. Step 4: Simplify right side
    20,705.99x = 361,543,493.30
  5. Step 5: Solve for x
    x = 361,543,493.30/20,705.99
  6. Step 6: Final answer
    x = 17,460.82

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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.