Home / 20,943.72-31,415.52-13,158

Finding the Fourth Proportional to 20,943.72, 31,415.52 and 13,158

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Solution

The fourth proportional to 20,943.72, 31,415.52 and 13,158 is: 19,736.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,943.72 : 31,415.52 = 13,158 : x
  2. Step 2: Convert to fraction form
    20,943.72/31,415.52 = 13,158/x
  3. Step 3: Cross multiply
    20,943.72x = 31,415.52 × 13,158
  4. Step 4: Simplify right side
    20,943.72x = 413,365,412.16
  5. Step 5: Solve for x
    x = 413,365,412.16/20,943.72
  6. Step 6: Final answer
    x = 19,736.96

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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.