Home / 11,689.10-16,128.80-6,909.81

Finding the Fourth Proportional to 11,689.10, 16,128.80 and 6,909.81

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Solution

The fourth proportional to 11,689.10, 16,128.80 and 6,909.81 is: 9,534.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,689.10 : 16,128.80 = 6,909.81 : x
  2. Step 2: Convert to fraction form
    11,689.10/16,128.80 = 6,909.81/x
  3. Step 3: Cross multiply
    11,689.10x = 16,128.80 × 6,909.81
  4. Step 4: Simplify right side
    11,689.10x = 111,446,908.98
  5. Step 5: Solve for x
    x = 111,446,908.98/11,689.10
  6. Step 6: Final answer
    x = 9,534.26

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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.