Home / 128,388.96-177,176.16-71,800.56

Finding the Fourth Proportional to 128,388.96, 177,176.16 and 71,800.56

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Solution

The fourth proportional to 128,388.96, 177,176.16 and 71,800.56 is: 99,084.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,388.96 : 177,176.16 = 71,800.56 : x
  2. Step 2: Convert to fraction form
    128,388.96/177,176.16 = 71,800.56/x
  3. Step 3: Cross multiply
    128,388.96x = 177,176.16 × 71,800.56
  4. Step 4: Simplify right side
    128,388.96x = 12,721,347,506.65
  5. Step 5: Solve for x
    x = 12,721,347,506.65/128,388.96
  6. Step 6: Final answer
    x = 99,084.43

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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.