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Finding the Fourth Proportional to 128,395.89, 177,191.62 and 71,034.30

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Solution

The fourth proportional to 128,395.89, 177,191.62 and 71,034.30 is: 98,030.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,395.89 : 177,191.62 = 71,034.30 : x
  2. Step 2: Convert to fraction form
    128,395.89/177,191.62 = 71,034.30/x
  3. Step 3: Cross multiply
    128,395.89x = 177,191.62 × 71,034.30
  4. Step 4: Simplify right side
    128,395.89x = 12,586,682,514.98
  5. Step 5: Solve for x
    x = 12,586,682,514.98/128,395.89
  6. Step 6: Final answer
    x = 98,030.26

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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.