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Finding the Fourth Proportional to 81,433.63, 112,400.87 and 57,239.94

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Solution

The fourth proportional to 81,433.63, 112,400.87 and 57,239.94 is: 79,006.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,433.63 : 112,400.87 = 57,239.94 : x
  2. Step 2: Convert to fraction form
    81,433.63/112,400.87 = 57,239.94/x
  3. Step 3: Cross multiply
    81,433.63x = 112,400.87 × 57,239.94
  4. Step 4: Simplify right side
    81,433.63x = 6,433,818,873.92
  5. Step 5: Solve for x
    x = 6,433,818,873.92/81,433.63
  6. Step 6: Final answer
    x = 79,006.90

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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.