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Finding the Fourth Proportional to 20,996.76, 28,965.42 and 13,048.32

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Solution

The fourth proportional to 20,996.76, 28,965.42 and 13,048.32 is: 18,000.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,996.76 : 28,965.42 = 13,048.32 : x
  2. Step 2: Convert to fraction form
    20,996.76/28,965.42 = 13,048.32/x
  3. Step 3: Cross multiply
    20,996.76x = 28,965.42 × 13,048.32
  4. Step 4: Simplify right side
    20,996.76x = 377,950,069.09
  5. Step 5: Solve for x
    x = 377,950,069.09/20,996.76
  6. Step 6: Final answer
    x = 18,000.40

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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.