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Finding the Fourth Proportional to 72,170.89, 99,591.81 and 39,903.64

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Solution

The fourth proportional to 72,170.89, 99,591.81 and 39,903.64 is: 55,064.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,170.89 : 99,591.81 = 39,903.64 : x
  2. Step 2: Convert to fraction form
    72,170.89/99,591.81 = 39,903.64/x
  3. Step 3: Cross multiply
    72,170.89x = 99,591.81 × 39,903.64
  4. Step 4: Simplify right side
    72,170.89x = 3,974,075,533.67
  5. Step 5: Solve for x
    x = 3,974,075,533.67/72,170.89
  6. Step 6: Final answer
    x = 55,064.80

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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.