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Finding the Fourth Proportional to 128,728.55, 193,133.15 and 57,710.75

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Solution

The fourth proportional to 128,728.55, 193,133.15 and 57,710.75 is: 86,584.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,728.55 : 193,133.15 = 57,710.75 : x
  2. Step 2: Convert to fraction form
    128,728.55/193,133.15 = 57,710.75/x
  3. Step 3: Cross multiply
    128,728.55x = 193,133.15 × 57,710.75
  4. Step 4: Simplify right side
    128,728.55x = 11,145,857,898.56
  5. Step 5: Solve for x
    x = 11,145,857,898.56/128,728.55
  6. Step 6: Final answer
    x = 86,584.19

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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.