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Finding the Fourth Proportional to 128,878.92, 193,235.76 and 54,051.84

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Solution

The fourth proportional to 128,878.92, 193,235.76 and 54,051.84 is: 81,043.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,878.92 : 193,235.76 = 54,051.84 : x
  2. Step 2: Convert to fraction form
    128,878.92/193,235.76 = 54,051.84/x
  3. Step 3: Cross multiply
    128,878.92x = 193,235.76 × 54,051.84
  4. Step 4: Simplify right side
    128,878.92x = 10,444,748,381.80
  5. Step 5: Solve for x
    x = 10,444,748,381.80/128,878.92
  6. Step 6: Final answer
    x = 81,043.11

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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.