Home / 12,840.90-17,710.97-8,120.62

Finding the Fourth Proportional to 12,840.90, 17,710.97 and 8,120.62

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Solution

The fourth proportional to 12,840.90, 17,710.97 and 8,120.62 is: 11,200.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840.90 : 17,710.97 = 8,120.62 : x
  2. Step 2: Convert to fraction form
    12,840.90/17,710.97 = 8,120.62/x
  3. Step 3: Cross multiply
    12,840.90x = 17,710.97 × 8,120.62
  4. Step 4: Simplify right side
    12,840.90x = 143,824,057.20
  5. Step 5: Solve for x
    x = 143,824,057.20/12,840.90
  6. Step 6: Final answer
    x = 11,200.47

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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.