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Finding the Fourth Proportional to 39,591, 54,635.60 and 21,686.65

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Solution

The fourth proportional to 39,591, 54,635.60 and 21,686.65 is: 29,927.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,591 : 54,635.60 = 21,686.65 : x
  2. Step 2: Convert to fraction form
    39,591/54,635.60 = 21,686.65/x
  3. Step 3: Cross multiply
    39,591x = 54,635.60 × 21,686.65
  4. Step 4: Simplify right side
    39,591x = 1,184,862,889.72
  5. Step 5: Solve for x
    x = 1,184,862,889.72/39,591
  6. Step 6: Final answer
    x = 29,927.58

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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.