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Finding the Fourth Proportional to 139,088.89, 191,946.32 and 78,668.46

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Solution

The fourth proportional to 139,088.89, 191,946.32 and 78,668.46 is: 108,564.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,088.89 : 191,946.32 = 78,668.46 : x
  2. Step 2: Convert to fraction form
    139,088.89/191,946.32 = 78,668.46/x
  3. Step 3: Cross multiply
    139,088.89x = 191,946.32 × 78,668.46
  4. Step 4: Simplify right side
    139,088.89x = 15,100,120,437.34
  5. Step 5: Solve for x
    x = 15,100,120,437.34/139,088.89
  6. Step 6: Final answer
    x = 108,564.54

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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.