Home / 13,215.48-18,240.84-8,178.90

Finding the Fourth Proportional to 13,215.48, 18,240.84 and 8,178.90

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Solution

The fourth proportional to 13,215.48, 18,240.84 and 8,178.90 is: 11,289.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215.48 : 18,240.84 = 8,178.90 : x
  2. Step 2: Convert to fraction form
    13,215.48/18,240.84 = 8,178.90/x
  3. Step 3: Cross multiply
    13,215.48x = 18,240.84 × 8,178.90
  4. Step 4: Simplify right side
    13,215.48x = 149,190,006.28
  5. Step 5: Solve for x
    x = 149,190,006.28/13,215.48
  6. Step 6: Final answer
    x = 11,289.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.