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Finding the Fourth Proportional to 28,408.93, 42,604.08 and 9,429.21

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Solution

The fourth proportional to 28,408.93, 42,604.08 and 9,429.21 is: 14,140.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,408.93 : 42,604.08 = 9,429.21 : x
  2. Step 2: Convert to fraction form
    28,408.93/42,604.08 = 9,429.21/x
  3. Step 3: Cross multiply
    28,408.93x = 42,604.08 × 9,429.21
  4. Step 4: Simplify right side
    28,408.93x = 401,722,781.82
  5. Step 5: Solve for x
    x = 401,722,781.82/28,408.93
  6. Step 6: Final answer
    x = 14,140.72

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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.