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Finding the Fourth Proportional to 136,921.70, 205,512.15 and 84,433.70

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Solution

The fourth proportional to 136,921.70, 205,512.15 and 84,433.70 is: 126,730.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,921.70 : 205,512.15 = 84,433.70 : x
  2. Step 2: Convert to fraction form
    136,921.70/205,512.15 = 84,433.70/x
  3. Step 3: Cross multiply
    136,921.70x = 205,512.15 × 84,433.70
  4. Step 4: Simplify right side
    136,921.70x = 17,352,151,219.46
  5. Step 5: Solve for x
    x = 17,352,151,219.46/136,921.70
  6. Step 6: Final answer
    x = 126,730.47

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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.