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Finding the Fourth Proportional to 128,691.01, 192,970.69 and 53,790.72

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Solution

The fourth proportional to 128,691.01, 192,970.69 and 53,790.72 is: 80,658.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,691.01 : 192,970.69 = 53,790.72 : x
  2. Step 2: Convert to fraction form
    128,691.01/192,970.69 = 53,790.72/x
  3. Step 3: Cross multiply
    128,691.01x = 192,970.69 × 53,790.72
  4. Step 4: Simplify right side
    128,691.01x = 10,380,032,354.00
  5. Step 5: Solve for x
    x = 10,380,032,354.00/128,691.01
  6. Step 6: Final answer
    x = 80,658.57

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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.