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Finding the Fourth Proportional to 72,173.81, 99,595.80 and 39,906.55

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Solution

The fourth proportional to 72,173.81, 99,595.80 and 39,906.55 is: 55,068.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,173.81 : 99,595.80 = 39,906.55 : x
  2. Step 2: Convert to fraction form
    72,173.81/99,595.80 = 39,906.55/x
  3. Step 3: Cross multiply
    72,173.81x = 99,595.80 × 39,906.55
  4. Step 4: Simplify right side
    72,173.81x = 3,974,524,729.11
  5. Step 5: Solve for x
    x = 3,974,524,729.11/72,173.81
  6. Step 6: Final answer
    x = 55,068.79

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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.