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Finding the Fourth Proportional to 128,661.08, 193,046.70 and 53,798.72

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Solution

The fourth proportional to 128,661.08, 193,046.70 and 53,798.72 is: 80,721.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,661.08 : 193,046.70 = 53,798.72 : x
  2. Step 2: Convert to fraction form
    128,661.08/193,046.70 = 53,798.72/x
  3. Step 3: Cross multiply
    128,661.08x = 193,046.70 × 53,798.72
  4. Step 4: Simplify right side
    128,661.08x = 10,385,665,360.22
  5. Step 5: Solve for x
    x = 10,385,665,360.22/128,661.08
  6. Step 6: Final answer
    x = 80,721.11

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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.