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Finding the Fourth Proportional to 72,945.90, 109,375.05 and 28,519.68

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Solution

The fourth proportional to 72,945.90, 109,375.05 and 28,519.68 is: 42,762.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,945.90 : 109,375.05 = 28,519.68 : x
  2. Step 2: Convert to fraction form
    72,945.90/109,375.05 = 28,519.68/x
  3. Step 3: Cross multiply
    72,945.90x = 109,375.05 × 28,519.68
  4. Step 4: Simplify right side
    72,945.90x = 3,119,341,425.98
  5. Step 5: Solve for x
    x = 3,119,341,425.98/72,945.90
  6. Step 6: Final answer
    x = 42,762.40

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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.