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Finding the Fourth Proportional to 20,948.90, 28,908.90 and 11,995.63

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Solution

The fourth proportional to 20,948.90, 28,908.90 and 11,995.63 is: 16,553.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,948.90 : 28,908.90 = 11,995.63 : x
  2. Step 2: Convert to fraction form
    20,948.90/28,908.90 = 11,995.63/x
  3. Step 3: Cross multiply
    20,948.90x = 28,908.90 × 11,995.63
  4. Step 4: Simplify right side
    20,948.90x = 346,780,395.83
  5. Step 5: Solve for x
    x = 346,780,395.83/20,948.90
  6. Step 6: Final answer
    x = 16,553.64

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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.