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Finding the Fourth Proportional to 128,396.53, 177,185.64 and 71,040.03

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Solution

The fourth proportional to 128,396.53, 177,185.64 and 71,040.03 is: 98,034.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,396.53 : 177,185.64 = 71,040.03 : x
  2. Step 2: Convert to fraction form
    128,396.53/177,185.64 = 71,040.03/x
  3. Step 3: Cross multiply
    128,396.53x = 177,185.64 × 71,040.03
  4. Step 4: Simplify right side
    128,396.53x = 12,587,273,181.17
  5. Step 5: Solve for x
    x = 12,587,273,181.17/128,396.53
  6. Step 6: Final answer
    x = 98,034.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.