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Finding the Fourth Proportional to 128,020.88, 191,979.97 and 53,090.12

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Solution

The fourth proportional to 128,020.88, 191,979.97 and 53,090.12 is: 79,613.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.88 : 191,979.97 = 53,090.12 : x
  2. Step 2: Convert to fraction form
    128,020.88/191,979.97 = 53,090.12/x
  3. Step 3: Cross multiply
    128,020.88x = 191,979.97 × 53,090.12
  4. Step 4: Simplify right side
    128,020.88x = 10,192,238,552.27
  5. Step 5: Solve for x
    x = 10,192,238,552.27/128,020.88
  6. Step 6: Final answer
    x = 79,613.88

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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.