Home / 131,121.20-196,681.80-68,783.60

Finding the Fourth Proportional to 131,121.20, 196,681.80 and 68,783.60

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Solution

The fourth proportional to 131,121.20, 196,681.80 and 68,783.60 is: 103,175.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,121.20 : 196,681.80 = 68,783.60 : x
  2. Step 2: Convert to fraction form
    131,121.20/196,681.80 = 68,783.60/x
  3. Step 3: Cross multiply
    131,121.20x = 196,681.80 × 68,783.60
  4. Step 4: Simplify right side
    131,121.20x = 13,528,482,258.48
  5. Step 5: Solve for x
    x = 13,528,482,258.48/131,121.20
  6. Step 6: Final answer
    x = 103,175.40

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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.