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Finding the Fourth Proportional to 39,942.70, 55,353.94 and 39,378.94

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Solution

The fourth proportional to 39,942.70, 55,353.94 and 39,378.94 is: 54,572.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,942.70 : 55,353.94 = 39,378.94 : x
  2. Step 2: Convert to fraction form
    39,942.70/55,353.94 = 39,378.94/x
  3. Step 3: Cross multiply
    39,942.70x = 55,353.94 × 39,378.94
  4. Step 4: Simplify right side
    39,942.70x = 2,179,779,245.19
  5. Step 5: Solve for x
    x = 2,179,779,245.19/39,942.70
  6. Step 6: Final answer
    x = 54,572.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.