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Finding the Fourth Proportional to 136,553, 188,441.25 and 76,128.62

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Solution

The fourth proportional to 136,553, 188,441.25 and 76,128.62 is: 105,056.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,553 : 188,441.25 = 76,128.62 : x
  2. Step 2: Convert to fraction form
    136,553/188,441.25 = 76,128.62/x
  3. Step 3: Cross multiply
    136,553x = 188,441.25 × 76,128.62
  4. Step 4: Simplify right side
    136,553x = 14,345,772,313.58
  5. Step 5: Solve for x
    x = 14,345,772,313.58/136,553
  6. Step 6: Final answer
    x = 105,056.44

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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.