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Finding the Fourth Proportional to 119,086.68, 178,636.74 and 39,129.72

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Solution

The fourth proportional to 119,086.68, 178,636.74 and 39,129.72 is: 58,696.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,086.68 : 178,636.74 = 39,129.72 : x
  2. Step 2: Convert to fraction form
    119,086.68/178,636.74 = 39,129.72/x
  3. Step 3: Cross multiply
    119,086.68x = 178,636.74 × 39,129.72
  4. Step 4: Simplify right side
    119,086.68x = 6,990,005,617.91
  5. Step 5: Solve for x
    x = 6,990,005,617.91/119,086.68
  6. Step 6: Final answer
    x = 58,696.79

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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.