Home / 131,201.40-196,686.90-78,631.80

Finding the Fourth Proportional to 131,201.40, 196,686.90 and 78,631.80

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Solution

The fourth proportional to 131,201.40, 196,686.90 and 78,631.80 is: 117,878.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,201.40 : 196,686.90 = 78,631.80 : x
  2. Step 2: Convert to fraction form
    131,201.40/196,686.90 = 78,631.80/x
  3. Step 3: Cross multiply
    131,201.40x = 196,686.90 × 78,631.80
  4. Step 4: Simplify right side
    131,201.40x = 15,465,844,983.42
  5. Step 5: Solve for x
    x = 15,465,844,983.42/131,201.40
  6. Step 6: Final answer
    x = 117,878.66

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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.