Home / 11,390.40-16,998.32-8,779.20

Finding the Fourth Proportional to 11,390.40, 16,998.32 and 8,779.20

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Solution

The fourth proportional to 11,390.40, 16,998.32 and 8,779.20 is: 13,101.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,390.40 : 16,998.32 = 8,779.20 : x
  2. Step 2: Convert to fraction form
    11,390.40/16,998.32 = 8,779.20/x
  3. Step 3: Cross multiply
    11,390.40x = 16,998.32 × 8,779.20
  4. Step 4: Simplify right side
    11,390.40x = 149,231,650.94
  5. Step 5: Solve for x
    x = 149,231,650.94/11,390.40
  6. Step 6: Final answer
    x = 13,101.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.