Home / 13,431.68-20,128.80-7,888.64

Finding the Fourth Proportional to 13,431.68, 20,128.80 and 7,888.64

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Solution

The fourth proportional to 13,431.68, 20,128.80 and 7,888.64 is: 11,821.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.68 : 20,128.80 = 7,888.64 : x
  2. Step 2: Convert to fraction form
    13,431.68/20,128.80 = 7,888.64/x
  3. Step 3: Cross multiply
    13,431.68x = 20,128.80 × 7,888.64
  4. Step 4: Simplify right side
    13,431.68x = 158,788,856.83
  5. Step 5: Solve for x
    x = 158,788,856.83/13,431.68
  6. Step 6: Final answer
    x = 11,821.97

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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.