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Finding the Fourth Proportional to 28,644.36, 42,968.60 and 11,987.63

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Solution

The fourth proportional to 28,644.36, 42,968.60 and 11,987.63 is: 17,982.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,644.36 : 42,968.60 = 11,987.63 : x
  2. Step 2: Convert to fraction form
    28,644.36/42,968.60 = 11,987.63/x
  3. Step 3: Cross multiply
    28,644.36x = 42,968.60 × 11,987.63
  4. Step 4: Simplify right side
    28,644.36x = 515,091,403.64
  5. Step 5: Solve for x
    x = 515,091,403.64/28,644.36
  6. Step 6: Final answer
    x = 17,982.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.