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Finding the Fourth Proportional to 20,993.48, 28,968.54 and 11,918.24

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Solution

The fourth proportional to 20,993.48, 28,968.54 and 11,918.24 is: 16,445.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.48 : 28,968.54 = 11,918.24 : x
  2. Step 2: Convert to fraction form
    20,993.48/28,968.54 = 11,918.24/x
  3. Step 3: Cross multiply
    20,993.48x = 28,968.54 × 11,918.24
  4. Step 4: Simplify right side
    20,993.48x = 345,254,012.17
  5. Step 5: Solve for x
    x = 345,254,012.17/20,993.48
  6. Step 6: Final answer
    x = 16,445.77

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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.