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Finding the Fourth Proportional to 72,956.50, 100,679.97 and 39,422.50

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Solution

The fourth proportional to 72,956.50, 100,679.97 and 39,422.50 is: 54,403.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,956.50 : 100,679.97 = 39,422.50 : x
  2. Step 2: Convert to fraction form
    72,956.50/100,679.97 = 39,422.50/x
  3. Step 3: Cross multiply
    72,956.50x = 100,679.97 × 39,422.50
  4. Step 4: Simplify right side
    72,956.50x = 3,969,056,117.33
  5. Step 5: Solve for x
    x = 3,969,056,117.33/72,956.50
  6. Step 6: Final answer
    x = 54,403.05

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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.