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Finding the Fourth Proportional to 20,805.98, 28,710.03 and 12,308.42

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Solution

The fourth proportional to 20,805.98, 28,710.03 and 12,308.42 is: 16,984.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.98 : 28,710.03 = 12,308.42 : x
  2. Step 2: Convert to fraction form
    20,805.98/28,710.03 = 12,308.42/x
  3. Step 3: Cross multiply
    20,805.98x = 28,710.03 × 12,308.42
  4. Step 4: Simplify right side
    20,805.98x = 353,374,963.90
  5. Step 5: Solve for x
    x = 353,374,963.90/20,805.98
  6. Step 6: Final answer
    x = 16,984.30

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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.