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Finding the Fourth Proportional to 38,640.60, 57,999.30 and 18,941.40

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Solution

The fourth proportional to 38,640.60, 57,999.30 and 18,941.40 is: 28,430.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,640.60 : 57,999.30 = 18,941.40 : x
  2. Step 2: Convert to fraction form
    38,640.60/57,999.30 = 18,941.40/x
  3. Step 3: Cross multiply
    38,640.60x = 57,999.30 × 18,941.40
  4. Step 4: Simplify right side
    38,640.60x = 1,098,587,941.02
  5. Step 5: Solve for x
    x = 1,098,587,941.02/38,640.60
  6. Step 6: Final answer
    x = 28,430.92

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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.