Home / 128,865.78-177,836.31-71,506.17

Finding the Fourth Proportional to 128,865.78, 177,836.31 and 71,506.17

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Solution

The fourth proportional to 128,865.78, 177,836.31 and 71,506.17 is: 98,679.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,865.78 : 177,836.31 = 71,506.17 : x
  2. Step 2: Convert to fraction form
    128,865.78/177,836.31 = 71,506.17/x
  3. Step 3: Cross multiply
    128,865.78x = 177,836.31 × 71,506.17
  4. Step 4: Simplify right side
    128,865.78x = 12,716,393,415.03
  5. Step 5: Solve for x
    x = 12,716,393,415.03/128,865.78
  6. Step 6: Final answer
    x = 98,679.37

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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.