Home / 13,415.79-20,120.81-8,415.75

Finding the Fourth Proportional to 13,415.79, 20,120.81 and 8,415.75

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Solution

The fourth proportional to 13,415.79, 20,120.81 and 8,415.75 is: 12,621.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.79 : 20,120.81 = 8,415.75 : x
  2. Step 2: Convert to fraction form
    13,415.79/20,120.81 = 8,415.75/x
  3. Step 3: Cross multiply
    13,415.79x = 20,120.81 × 8,415.75
  4. Step 4: Simplify right side
    13,415.79x = 169,331,664.68
  5. Step 5: Solve for x
    x = 169,331,664.68/13,415.79
  6. Step 6: Final answer
    x = 12,621.82

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1.5x scale

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.