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Finding the Fourth Proportional to 20,728.16, 28,615.80 and 16,650.80

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Solution

The fourth proportional to 20,728.16, 28,615.80 and 16,650.80 is: 22,986.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.16 : 28,615.80 = 16,650.80 : x
  2. Step 2: Convert to fraction form
    20,728.16/28,615.80 = 16,650.80/x
  3. Step 3: Cross multiply
    20,728.16x = 28,615.80 × 16,650.80
  4. Step 4: Simplify right side
    20,728.16x = 476,475,962.64
  5. Step 5: Solve for x
    x = 476,475,962.64/20,728.16
  6. Step 6: Final answer
    x = 22,986.89

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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.