Home / 128,988.45-177,998.07-71,631.42

Finding the Fourth Proportional to 128,988.45, 177,998.07 and 71,631.42

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Solution

The fourth proportional to 128,988.45, 177,998.07 and 71,631.42 is: 98,848.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.45 : 177,998.07 = 71,631.42 : x
  2. Step 2: Convert to fraction form
    128,988.45/177,998.07 = 71,631.42/x
  3. Step 3: Cross multiply
    128,988.45x = 177,998.07 × 71,631.42
  4. Step 4: Simplify right side
    128,988.45x = 12,750,254,112.48
  5. Step 5: Solve for x
    x = 12,750,254,112.48/128,988.45
  6. Step 6: Final answer
    x = 98,848.03

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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.