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Finding the Fourth Proportional to 117,987.81, 177,007.62 and 86,728.29

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Solution

The fourth proportional to 117,987.81, 177,007.62 and 86,728.29 is: 130,111.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,987.81 : 177,007.62 = 86,728.29 : x
  2. Step 2: Convert to fraction form
    117,987.81/177,007.62 = 86,728.29/x
  3. Step 3: Cross multiply
    117,987.81x = 177,007.62 × 86,728.29
  4. Step 4: Simplify right side
    117,987.81x = 15,351,568,199.57
  5. Step 5: Solve for x
    x = 15,351,568,199.57/117,987.81
  6. Step 6: Final answer
    x = 130,111.48

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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.