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Finding the Fourth Proportional to 90,836.64, 136,268.64 and 28,512

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Solution

The fourth proportional to 90,836.64, 136,268.64 and 28,512 is: 42,772.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,836.64 : 136,268.64 = 28,512 : x
  2. Step 2: Convert to fraction form
    90,836.64/136,268.64 = 28,512/x
  3. Step 3: Cross multiply
    90,836.64x = 136,268.64 × 28,512
  4. Step 4: Simplify right side
    90,836.64x = 3,885,291,463.68
  5. Step 5: Solve for x
    x = 3,885,291,463.68/90,836.64
  6. Step 6: Final answer
    x = 42,772.29

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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.