Home / 142,078.80-196,063.12-81,659.28

Finding the Fourth Proportional to 142,078.80, 196,063.12 and 81,659.28

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Solution

The fourth proportional to 142,078.80, 196,063.12 and 81,659.28 is: 112,686.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,078.80 : 196,063.12 = 81,659.28 : x
  2. Step 2: Convert to fraction form
    142,078.80/196,063.12 = 81,659.28/x
  3. Step 3: Cross multiply
    142,078.80x = 196,063.12 × 81,659.28
  4. Step 4: Simplify right side
    142,078.80x = 16,010,373,213.75
  5. Step 5: Solve for x
    x = 16,010,373,213.75/142,078.80
  6. Step 6: Final answer
    x = 112,686.57

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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.