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Finding the Fourth Proportional to 128,021.88, 191,981.47 and 53,091.12

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Solution

The fourth proportional to 128,021.88, 191,981.47 and 53,091.12 is: 79,615.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,021.88 : 191,981.47 = 53,091.12 : x
  2. Step 2: Convert to fraction form
    128,021.88/191,981.47 = 53,091.12/x
  3. Step 3: Cross multiply
    128,021.88x = 191,981.47 × 53,091.12
  4. Step 4: Simplify right side
    128,021.88x = 10,192,511,261.55
  5. Step 5: Solve for x
    x = 10,192,511,261.55/128,021.88
  6. Step 6: Final answer
    x = 79,615.38

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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.