Home / 142,379.88-196,483.14-78,720.36

Finding the Fourth Proportional to 142,379.88, 196,483.14 and 78,720.36

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Solution

The fourth proportional to 142,379.88, 196,483.14 and 78,720.36 is: 108,633.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,379.88 : 196,483.14 = 78,720.36 : x
  2. Step 2: Convert to fraction form
    142,379.88/196,483.14 = 78,720.36/x
  3. Step 3: Cross multiply
    142,379.88x = 196,483.14 × 78,720.36
  4. Step 4: Simplify right side
    142,379.88x = 15,467,223,514.73
  5. Step 5: Solve for x
    x = 15,467,223,514.73/142,379.88
  6. Step 6: Final answer
    x = 108,633.49

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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.