Home / 131,123.40-196,830.90-81,259.80

Finding the Fourth Proportional to 131,123.40, 196,830.90 and 81,259.80

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Solution

The fourth proportional to 131,123.40, 196,830.90 and 81,259.80 is: 121,980.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,123.40 : 196,830.90 = 81,259.80 : x
  2. Step 2: Convert to fraction form
    131,123.40/196,830.90 = 81,259.80/x
  3. Step 3: Cross multiply
    131,123.40x = 196,830.90 × 81,259.80
  4. Step 4: Simplify right side
    131,123.40x = 15,994,439,567.82
  5. Step 5: Solve for x
    x = 15,994,439,567.82/131,123.40
  6. Step 6: Final answer
    x = 121,980.06

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1.5x scale

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.