Home / 13,122.76-18,105.30-7,815.88

Finding the Fourth Proportional to 13,122.76, 18,105.30 and 7,815.88

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Solution

The fourth proportional to 13,122.76, 18,105.30 and 7,815.88 is: 10,783.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,122.76 : 18,105.30 = 7,815.88 : x
  2. Step 2: Convert to fraction form
    13,122.76/18,105.30 = 7,815.88/x
  3. Step 3: Cross multiply
    13,122.76x = 18,105.30 × 7,815.88
  4. Step 4: Simplify right side
    13,122.76x = 141,508,852.16
  5. Step 5: Solve for x
    x = 141,508,852.16/13,122.76
  6. Step 6: Final answer
    x = 10,783.47

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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.