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Finding the Fourth Proportional to 28,679.94, 42,963.90 and 18,789.18

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Solution

The fourth proportional to 28,679.94, 42,963.90 and 18,789.18 is: 28,147.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,679.94 : 42,963.90 = 18,789.18 : x
  2. Step 2: Convert to fraction form
    28,679.94/42,963.90 = 18,789.18/x
  3. Step 3: Cross multiply
    28,679.94x = 42,963.90 × 18,789.18
  4. Step 4: Simplify right side
    28,679.94x = 807,256,450.60
  5. Step 5: Solve for x
    x = 807,256,450.60/28,679.94
  6. Step 6: Final answer
    x = 28,147.08

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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.