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Finding the Fourth Proportional to 72,486.28, 108,771.54 and 30,362.64

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Solution

The fourth proportional to 72,486.28, 108,771.54 and 30,362.64 is: 45,561.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,486.28 : 108,771.54 = 30,362.64 : x
  2. Step 2: Convert to fraction form
    72,486.28/108,771.54 = 30,362.64/x
  3. Step 3: Cross multiply
    72,486.28x = 108,771.54 × 30,362.64
  4. Step 4: Simplify right side
    72,486.28x = 3,302,591,111.27
  5. Step 5: Solve for x
    x = 3,302,591,111.27/72,486.28
  6. Step 6: Final answer
    x = 45,561.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.