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Finding the Fourth Proportional to 79,849.80, 119,628.90 and 64,978.20

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Solution

The fourth proportional to 79,849.80, 119,628.90 and 64,978.20 is: 97,348.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,849.80 : 119,628.90 = 64,978.20 : x
  2. Step 2: Convert to fraction form
    79,849.80/119,628.90 = 64,978.20/x
  3. Step 3: Cross multiply
    79,849.80x = 119,628.90 × 64,978.20
  4. Step 4: Simplify right side
    79,849.80x = 7,773,270,589.98
  5. Step 5: Solve for x
    x = 7,773,270,589.98/79,849.80
  6. Step 6: Final answer
    x = 97,348.65

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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.