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Finding the Fourth Proportional to 121,712.87, 182,569.39 and 79,628.31

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Solution

The fourth proportional to 121,712.87, 182,569.39 and 79,628.31 is: 119,442.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,712.87 : 182,569.39 = 79,628.31 : x
  2. Step 2: Convert to fraction form
    121,712.87/182,569.39 = 79,628.31/x
  3. Step 3: Cross multiply
    121,712.87x = 182,569.39 × 79,628.31
  4. Step 4: Simplify right side
    121,712.87x = 14,537,691,784.36
  5. Step 5: Solve for x
    x = 14,537,691,784.36/121,712.87
  6. Step 6: Final answer
    x = 119,442.52

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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.