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Finding the Fourth Proportional to 136,996.78, 189,047.97 and 76,555.39

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Solution

The fourth proportional to 136,996.78, 189,047.97 and 76,555.39 is: 105,642.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,996.78 : 189,047.97 = 76,555.39 : x
  2. Step 2: Convert to fraction form
    136,996.78/189,047.97 = 76,555.39/x
  3. Step 3: Cross multiply
    136,996.78x = 189,047.97 × 76,555.39
  4. Step 4: Simplify right side
    136,996.78x = 14,472,641,072.06
  5. Step 5: Solve for x
    x = 14,472,641,072.06/136,996.78
  6. Step 6: Final answer
    x = 105,642.20

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1.5x scale

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.