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Finding the Fourth Proportional to 136,592.80, 205,055.60 and 86,672.80

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Solution

The fourth proportional to 136,592.80, 205,055.60 and 86,672.80 is: 130,114.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,592.80 : 205,055.60 = 86,672.80 : x
  2. Step 2: Convert to fraction form
    136,592.80/205,055.60 = 86,672.80/x
  3. Step 3: Cross multiply
    136,592.80x = 205,055.60 × 86,672.80
  4. Step 4: Simplify right side
    136,592.80x = 17,772,743,007.68
  5. Step 5: Solve for x
    x = 17,772,743,007.68/136,592.80
  6. Step 6: Final answer
    x = 130,114.79

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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.