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Finding the Fourth Proportional to 28,991.60, 40,009.56 and 16,415.60

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Solution

The fourth proportional to 28,991.60, 40,009.56 and 16,415.60 is: 22,654.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,991.60 : 40,009.56 = 16,415.60 : x
  2. Step 2: Convert to fraction form
    28,991.60/40,009.56 = 16,415.60/x
  3. Step 3: Cross multiply
    28,991.60x = 40,009.56 × 16,415.60
  4. Step 4: Simplify right side
    28,991.60x = 656,780,933.14
  5. Step 5: Solve for x
    x = 656,780,933.14/28,991.60
  6. Step 6: Final answer
    x = 22,654.18

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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.