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Finding the Fourth Proportional to 128,682.61, 177,588.53 and 74,214.51

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Solution

The fourth proportional to 128,682.61, 177,588.53 and 74,214.51 is: 102,419.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,682.61 : 177,588.53 = 74,214.51 : x
  2. Step 2: Convert to fraction form
    128,682.61/177,588.53 = 74,214.51/x
  3. Step 3: Cross multiply
    128,682.61x = 177,588.53 × 74,214.51
  4. Step 4: Simplify right side
    128,682.61x = 13,179,645,735.57
  5. Step 5: Solve for x
    x = 13,179,645,735.57/128,682.61
  6. Step 6: Final answer
    x = 102,419.79

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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.