Home / 142,739.20-196,981.68-79,078

Finding the Fourth Proportional to 142,739.20, 196,981.68 and 79,078

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Solution

The fourth proportional to 142,739.20, 196,981.68 and 79,078 is: 109,128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,739.20 : 196,981.68 = 79,078 : x
  2. Step 2: Convert to fraction form
    142,739.20/196,981.68 = 79,078/x
  3. Step 3: Cross multiply
    142,739.20x = 196,981.68 × 79,078
  4. Step 4: Simplify right side
    142,739.20x = 15,576,917,291.04
  5. Step 5: Solve for x
    x = 15,576,917,291.04/142,739.20
  6. Step 6: Final answer
    x = 109,128.52

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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.