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Finding the Fourth Proportional to 72,170.53, 99,591.31 and 39,903.28

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Solution

The fourth proportional to 72,170.53, 99,591.31 and 39,903.28 is: 55,064.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,170.53 : 99,591.31 = 39,903.28 : x
  2. Step 2: Convert to fraction form
    72,170.53/99,591.31 = 39,903.28/x
  3. Step 3: Cross multiply
    72,170.53x = 99,591.31 × 39,903.28
  4. Step 4: Simplify right side
    72,170.53x = 3,974,019,928.50
  5. Step 5: Solve for x
    x = 3,974,019,928.50/72,170.53
  6. Step 6: Final answer
    x = 55,064.30

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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.