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Finding the Fourth Proportional to 72,213.25, 99,652.42 and 39,947.03

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Solution

The fourth proportional to 72,213.25, 99,652.42 and 39,947.03 is: 55,125.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,213.25 : 99,652.42 = 39,947.03 : x
  2. Step 2: Convert to fraction form
    72,213.25/99,652.42 = 39,947.03/x
  3. Step 3: Cross multiply
    72,213.25x = 99,652.42 × 39,947.03
  4. Step 4: Simplify right side
    72,213.25x = 3,980,818,211.31
  5. Step 5: Solve for x
    x = 3,980,818,211.31/72,213.25
  6. Step 6: Final answer
    x = 55,125.87

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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.