Home / 40,720.41-61,077.72-12,639.80

Finding the Fourth Proportional to 40,720.41, 61,077.72 and 12,639.80

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Solution

The fourth proportional to 40,720.41, 61,077.72 and 12,639.80 is: 18,958.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,720.41 : 61,077.72 = 12,639.80 : x
  2. Step 2: Convert to fraction form
    40,720.41/61,077.72 = 12,639.80/x
  3. Step 3: Cross multiply
    40,720.41x = 61,077.72 × 12,639.80
  4. Step 4: Simplify right side
    40,720.41x = 772,009,859.87
  5. Step 5: Solve for x
    x = 772,009,859.87/40,720.41
  6. Step 6: Final answer
    x = 18,958.79

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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.