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Finding the Fourth Proportional to 18,905.16, 28,361.79 and 5,758.59

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Solution

The fourth proportional to 18,905.16, 28,361.79 and 5,758.59 is: 8,639.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.16 : 28,361.79 = 5,758.59 : x
  2. Step 2: Convert to fraction form
    18,905.16/28,361.79 = 5,758.59/x
  3. Step 3: Cross multiply
    18,905.16x = 28,361.79 × 5,758.59
  4. Step 4: Simplify right side
    18,905.16x = 163,323,920.28
  5. Step 5: Solve for x
    x = 163,323,920.28/18,905.16
  6. Step 6: Final answer
    x = 8,639.12

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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.