Home / 142,143.20-196,156.72-78,480.44

Finding the Fourth Proportional to 142,143.20, 196,156.72 and 78,480.44

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Solution

The fourth proportional to 142,143.20, 196,156.72 and 78,480.44 is: 108,302.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,143.20 : 196,156.72 = 78,480.44 : x
  2. Step 2: Convert to fraction form
    142,143.20/196,156.72 = 78,480.44/x
  3. Step 3: Cross multiply
    142,143.20x = 196,156.72 × 78,480.44
  4. Step 4: Simplify right side
    142,143.20x = 15,394,465,694.56
  5. Step 5: Solve for x
    x = 15,394,465,694.56/142,143.20
  6. Step 6: Final answer
    x = 108,302.51

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1.5x scale

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.