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Finding the Fourth Proportional to 128,987.56, 177,993.07 and 72,388

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Solution

The fourth proportional to 128,987.56, 177,993.07 and 72,388 is: 99,889.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,987.56 : 177,993.07 = 72,388 : x
  2. Step 2: Convert to fraction form
    128,987.56/177,993.07 = 72,388/x
  3. Step 3: Cross multiply
    128,987.56x = 177,993.07 × 72,388
  4. Step 4: Simplify right side
    128,987.56x = 12,884,562,170.19
  5. Step 5: Solve for x
    x = 12,884,562,170.19/128,987.56
  6. Step 6: Final answer
    x = 99,889.96

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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.