Home / 20,458.66-30,678.10-7,131.36

Finding the Fourth Proportional to 20,458.66, 30,678.10 and 7,131.36

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Solution

The fourth proportional to 20,458.66, 30,678.10 and 7,131.36 is: 10,693.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,458.66 : 30,678.10 = 7,131.36 : x
  2. Step 2: Convert to fraction form
    20,458.66/30,678.10 = 7,131.36/x
  3. Step 3: Cross multiply
    20,458.66x = 30,678.10 × 7,131.36
  4. Step 4: Simplify right side
    20,458.66x = 218,776,575.22
  5. Step 5: Solve for x
    x = 218,776,575.22/20,458.66
  6. Step 6: Final answer
    x = 10,693.59

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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.