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Finding the Fourth Proportional to 128,958.84, 193,416.36 and 58,821.72

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Solution

The fourth proportional to 128,958.84, 193,416.36 and 58,821.72 is: 88,222.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,958.84 : 193,416.36 = 58,821.72 : x
  2. Step 2: Convert to fraction form
    128,958.84/193,416.36 = 58,821.72/x
  3. Step 3: Cross multiply
    128,958.84x = 193,416.36 × 58,821.72
  4. Step 4: Simplify right side
    128,958.84x = 11,377,082,971.34
  5. Step 5: Solve for x
    x = 11,377,082,971.34/128,958.84
  6. Step 6: Final answer
    x = 88,222.59

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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.