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Finding the Fourth Proportional to 11,980.80, 16,588.80 and 11,059.20

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Solution

The fourth proportional to 11,980.80, 16,588.80 and 11,059.20 is: 15,312.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,980.80 : 16,588.80 = 11,059.20 : x
  2. Step 2: Convert to fraction form
    11,980.80/16,588.80 = 11,059.20/x
  3. Step 3: Cross multiply
    11,980.80x = 16,588.80 × 11,059.20
  4. Step 4: Simplify right side
    11,980.80x = 183,458,856.96
  5. Step 5: Solve for x
    x = 183,458,856.96/11,980.80
  6. Step 6: Final answer
    x = 15,312.74

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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.