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Finding the Fourth Proportional to 20,634.94, 28,477.94 and 12,679.93

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Solution

The fourth proportional to 20,634.94, 28,477.94 and 12,679.93 is: 17,499.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,634.94 : 28,477.94 = 12,679.93 : x
  2. Step 2: Convert to fraction form
    20,634.94/28,477.94 = 12,679.93/x
  3. Step 3: Cross multiply
    20,634.94x = 28,477.94 × 12,679.93
  4. Step 4: Simplify right side
    20,634.94x = 361,098,285.74
  5. Step 5: Solve for x
    x = 361,098,285.74/20,634.94
  6. Step 6: Final answer
    x = 17,499.36

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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.