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Finding the Fourth Proportional to 20,668.63, 28,472.09 and 14,986.68

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Solution

The fourth proportional to 20,668.63, 28,472.09 and 14,986.68 is: 20,644.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,668.63 : 28,472.09 = 14,986.68 : x
  2. Step 2: Convert to fraction form
    20,668.63/28,472.09 = 14,986.68/x
  3. Step 3: Cross multiply
    20,668.63x = 28,472.09 × 14,986.68
  4. Step 4: Simplify right side
    20,668.63x = 426,702,101.76
  5. Step 5: Solve for x
    x = 426,702,101.76/20,668.63
  6. Step 6: Final answer
    x = 20,644.91

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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.