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Finding the Fourth Proportional to 128,668.65, 192,937.14 and 53,768.34

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Solution

The fourth proportional to 128,668.65, 192,937.14 and 53,768.34 is: 80,625.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,668.65 : 192,937.14 = 53,768.34 : x
  2. Step 2: Convert to fraction form
    128,668.65/192,937.14 = 53,768.34/x
  3. Step 3: Cross multiply
    128,668.65x = 192,937.14 × 53,768.34
  4. Step 4: Simplify right side
    128,668.65x = 10,373,909,742.15
  5. Step 5: Solve for x
    x = 10,373,909,742.15/128,668.65
  6. Step 6: Final answer
    x = 80,625.00

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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.