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Finding the Fourth Proportional to 136,680.40, 205,020.60 and 83,918.80

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Solution

The fourth proportional to 136,680.40, 205,020.60 and 83,918.80 is: 125,878.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,680.40 : 205,020.60 = 83,918.80 : x
  2. Step 2: Convert to fraction form
    136,680.40/205,020.60 = 83,918.80/x
  3. Step 3: Cross multiply
    136,680.40x = 205,020.60 × 83,918.80
  4. Step 4: Simplify right side
    136,680.40x = 17,205,082,727.28
  5. Step 5: Solve for x
    x = 17,205,082,727.28/136,680.40
  6. Step 6: Final answer
    x = 125,878.20

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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.