Home / 21,120.56-31,691.64-14,105.36

Finding the Fourth Proportional to 21,120.56, 31,691.64 and 14,105.36

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Solution

The fourth proportional to 21,120.56, 31,691.64 and 14,105.36 is: 21,165.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.56 : 31,691.64 = 14,105.36 : x
  2. Step 2: Convert to fraction form
    21,120.56/31,691.64 = 14,105.36/x
  3. Step 3: Cross multiply
    21,120.56x = 31,691.64 × 14,105.36
  4. Step 4: Simplify right side
    21,120.56x = 447,021,991.19
  5. Step 5: Solve for x
    x = 447,021,991.19/21,120.56
  6. Step 6: Final answer
    x = 21,165.25

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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.