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Finding the Fourth Proportional to 128,661.96, 192,991.10 and 57,565.80

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Solution

The fourth proportional to 128,661.96, 192,991.10 and 57,565.80 is: 86,347.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,661.96 : 192,991.10 = 57,565.80 : x
  2. Step 2: Convert to fraction form
    128,661.96/192,991.10 = 57,565.80/x
  3. Step 3: Cross multiply
    128,661.96x = 192,991.10 × 57,565.80
  4. Step 4: Simplify right side
    128,661.96x = 11,109,687,064.38
  5. Step 5: Solve for x
    x = 11,109,687,064.38/128,661.96
  6. Step 6: Final answer
    x = 86,347.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.