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Finding the Fourth Proportional to 255,489.18, 383,278.79 and 105,645.51

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Solution

The fourth proportional to 255,489.18, 383,278.79 and 105,645.51 is: 158,486.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,489.18 : 383,278.79 = 105,645.51 : x
  2. Step 2: Convert to fraction form
    255,489.18/383,278.79 = 105,645.51/x
  3. Step 3: Cross multiply
    255,489.18x = 383,278.79 × 105,645.51
  4. Step 4: Simplify right side
    255,489.18x = 40,491,683,241.73
  5. Step 5: Solve for x
    x = 40,491,683,241.73/255,489.18
  6. Step 6: Final answer
    x = 158,486.88

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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.