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Finding the Fourth Proportional to 81,372, 122,058.72 and 28,790.40

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Solution

The fourth proportional to 81,372, 122,058.72 and 28,790.40 is: 43,185.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,372 : 122,058.72 = 28,790.40 : x
  2. Step 2: Convert to fraction form
    81,372/122,058.72 = 28,790.40/x
  3. Step 3: Cross multiply
    81,372x = 122,058.72 × 28,790.40
  4. Step 4: Simplify right side
    81,372x = 3,514,119,372.29
  5. Step 5: Solve for x
    x = 3,514,119,372.29/81,372
  6. Step 6: Final answer
    x = 43,185.85

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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.