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Finding the Fourth Proportional to 128,513.67, 177,327.78 and 80,733.20

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Solution

The fourth proportional to 128,513.67, 177,327.78 and 80,733.20 is: 111,398.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,513.67 : 177,327.78 = 80,733.20 : x
  2. Step 2: Convert to fraction form
    128,513.67/177,327.78 = 80,733.20/x
  3. Step 3: Cross multiply
    128,513.67x = 177,327.78 × 80,733.20
  4. Step 4: Simplify right side
    128,513.67x = 14,316,238,241.66
  5. Step 5: Solve for x
    x = 14,316,238,241.66/128,513.67
  6. Step 6: Final answer
    x = 111,398.56

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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.