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Finding the Fourth Proportional to 65,980.88, 91,042.08 and 39,129.99

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Solution

The fourth proportional to 65,980.88, 91,042.08 and 39,129.99 is: 53,992.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,980.88 : 91,042.08 = 39,129.99 : x
  2. Step 2: Convert to fraction form
    65,980.88/91,042.08 = 39,129.99/x
  3. Step 3: Cross multiply
    65,980.88x = 91,042.08 × 39,129.99
  4. Step 4: Simplify right side
    65,980.88x = 3,562,475,191.83
  5. Step 5: Solve for x
    x = 3,562,475,191.83/65,980.88
  6. Step 6: Final answer
    x = 53,992.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.