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Finding the Fourth Proportional to 20,994.72, 28,986.64 and 13,048.80

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Solution

The fourth proportional to 20,994.72, 28,986.64 and 13,048.80 is: 18,016.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.72 : 28,986.64 = 13,048.80 : x
  2. Step 2: Convert to fraction form
    20,994.72/28,986.64 = 13,048.80/x
  3. Step 3: Cross multiply
    20,994.72x = 28,986.64 × 13,048.80
  4. Step 4: Simplify right side
    20,994.72x = 378,240,868.03
  5. Step 5: Solve for x
    x = 378,240,868.03/20,994.72
  6. Step 6: Final answer
    x = 18,016.00

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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.