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Finding the Fourth Proportional to 20,663, 28,519.80 and 12,284.36

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Solution

The fourth proportional to 20,663, 28,519.80 and 12,284.36 is: 16,955.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,663 : 28,519.80 = 12,284.36 : x
  2. Step 2: Convert to fraction form
    20,663/28,519.80 = 12,284.36/x
  3. Step 3: Cross multiply
    20,663x = 28,519.80 × 12,284.36
  4. Step 4: Simplify right side
    20,663x = 350,347,490.33
  5. Step 5: Solve for x
    x = 350,347,490.33/20,663
  6. Step 6: Final answer
    x = 16,955.31

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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.