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Finding the Fourth Proportional to 128,810.51, 177,745.79 and 71,448.83

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Solution

The fourth proportional to 128,810.51, 177,745.79 and 71,448.83 is: 98,592.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,810.51 : 177,745.79 = 71,448.83 : x
  2. Step 2: Convert to fraction form
    128,810.51/177,745.79 = 71,448.83/x
  3. Step 3: Cross multiply
    128,810.51x = 177,745.79 × 71,448.83
  4. Step 4: Simplify right side
    128,810.51x = 12,699,728,022.82
  5. Step 5: Solve for x
    x = 12,699,728,022.82/128,810.51
  6. Step 6: Final answer
    x = 98,592.33

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1.5x scale

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.