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Finding the Fourth Proportional to 28,169.90, 42,241.20 and 14,123.90

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Solution

The fourth proportional to 28,169.90, 42,241.20 and 14,123.90 is: 21,179.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,169.90 : 42,241.20 = 14,123.90 : x
  2. Step 2: Convert to fraction form
    28,169.90/42,241.20 = 14,123.90/x
  3. Step 3: Cross multiply
    28,169.90x = 42,241.20 × 14,123.90
  4. Step 4: Simplify right side
    28,169.90x = 596,610,484.68
  5. Step 5: Solve for x
    x = 596,610,484.68/28,169.90
  6. Step 6: Final answer
    x = 21,179.01

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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.