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Finding the Fourth Proportional to 38,643.70, 57,965.55 and 18,912.10

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Solution

The fourth proportional to 38,643.70, 57,965.55 and 18,912.10 is: 28,368.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,643.70 : 57,965.55 = 18,912.10 : x
  2. Step 2: Convert to fraction form
    38,643.70/57,965.55 = 18,912.10/x
  3. Step 3: Cross multiply
    38,643.70x = 57,965.55 × 18,912.10
  4. Step 4: Simplify right side
    38,643.70x = 1,096,250,278.16
  5. Step 5: Solve for x
    x = 1,096,250,278.16/38,643.70
  6. Step 6: Final answer
    x = 28,368.15

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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.