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Finding the Fourth Proportional to 72,912.28, 100,618.92 and 39,378.28

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Solution

The fourth proportional to 72,912.28, 100,618.92 and 39,378.28 is: 54,342.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.28 : 100,618.92 = 39,378.28 : x
  2. Step 2: Convert to fraction form
    72,912.28/100,618.92 = 39,378.28/x
  3. Step 3: Cross multiply
    72,912.28x = 100,618.92 × 39,378.28
  4. Step 4: Simplify right side
    72,912.28x = 3,962,200,005.06
  5. Step 5: Solve for x
    x = 3,962,200,005.06/72,912.28
  6. Step 6: Final answer
    x = 54,342.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.