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Finding the Fourth Proportional to 39,980.99, 59,905.85 and 13,671.38

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Solution

The fourth proportional to 39,980.99, 59,905.85 and 13,671.38 is: 20,484.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,980.99 : 59,905.85 = 13,671.38 : x
  2. Step 2: Convert to fraction form
    39,980.99/59,905.85 = 13,671.38/x
  3. Step 3: Cross multiply
    39,980.99x = 59,905.85 × 13,671.38
  4. Step 4: Simplify right side
    39,980.99x = 818,995,720.98
  5. Step 5: Solve for x
    x = 818,995,720.98/39,980.99
  6. Step 6: Final answer
    x = 20,484.63

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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.