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Finding the Fourth Proportional to 81,489.51, 112,455.36 and 49,658.58

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Solution

The fourth proportional to 81,489.51, 112,455.36 and 49,658.58 is: 68,528.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,489.51 : 112,455.36 = 49,658.58 : x
  2. Step 2: Convert to fraction form
    81,489.51/112,455.36 = 49,658.58/x
  3. Step 3: Cross multiply
    81,489.51x = 112,455.36 × 49,658.58
  4. Step 4: Simplify right side
    81,489.51x = 5,584,373,490.99
  5. Step 5: Solve for x
    x = 5,584,373,490.99/81,489.51
  6. Step 6: Final answer
    x = 68,528.74

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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.