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Finding the Fourth Proportional to 61,078.90, 91,631.43 and 18,958.10

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Solution

The fourth proportional to 61,078.90, 91,631.43 and 18,958.10 is: 28,441.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,078.90 : 91,631.43 = 18,958.10 : x
  2. Step 2: Convert to fraction form
    61,078.90/91,631.43 = 18,958.10/x
  3. Step 3: Cross multiply
    61,078.90x = 91,631.43 × 18,958.10
  4. Step 4: Simplify right side
    61,078.90x = 1,737,157,813.08
  5. Step 5: Solve for x
    x = 1,737,157,813.08/61,078.90
  6. Step 6: Final answer
    x = 28,441.21

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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.