Home / 128,786.40-177,762.33-77,791.05

Finding the Fourth Proportional to 128,786.40, 177,762.33 and 77,791.05

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Solution

The fourth proportional to 128,786.40, 177,762.33 and 77,791.05 is: 107,374.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,786.40 : 177,762.33 = 77,791.05 : x
  2. Step 2: Convert to fraction form
    128,786.40/177,762.33 = 77,791.05/x
  3. Step 3: Cross multiply
    128,786.40x = 177,762.33 × 77,791.05
  4. Step 4: Simplify right side
    128,786.40x = 13,828,318,301.15
  5. Step 5: Solve for x
    x = 13,828,318,301.15/128,786.40
  6. Step 6: Final answer
    x = 107,374.06

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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.