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Finding the Fourth Proportional to 136,688.87, 188,630.06 and 76,259.57

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Solution

The fourth proportional to 136,688.87, 188,630.06 and 76,259.57 is: 105,237.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,688.87 : 188,630.06 = 76,259.57 : x
  2. Step 2: Convert to fraction form
    136,688.87/188,630.06 = 76,259.57/x
  3. Step 3: Cross multiply
    136,688.87x = 188,630.06 × 76,259.57
  4. Step 4: Simplify right side
    136,688.87x = 14,384,845,940.23
  5. Step 5: Solve for x
    x = 14,384,845,940.23/136,688.87
  6. Step 6: Final answer
    x = 105,237.87

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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.