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Finding the Fourth Proportional to 79,731, 119,670.30 and 40,315.80

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Solution

The fourth proportional to 79,731, 119,670.30 and 40,315.80 is: 60,511.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,731 : 119,670.30 = 40,315.80 : x
  2. Step 2: Convert to fraction form
    79,731/119,670.30 = 40,315.80/x
  3. Step 3: Cross multiply
    79,731x = 119,670.30 × 40,315.80
  4. Step 4: Simplify right side
    79,731x = 4,824,603,880.74
  5. Step 5: Solve for x
    x = 4,824,603,880.74/79,731
  6. Step 6: Final answer
    x = 60,511.02

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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.