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Finding the Fourth Proportional to 136,872.55, 205,243.21 and 70,278.40

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Solution

The fourth proportional to 136,872.55, 205,243.21 and 70,278.40 is: 105,383.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,872.55 : 205,243.21 = 70,278.40 : x
  2. Step 2: Convert to fraction form
    136,872.55/205,243.21 = 70,278.40/x
  3. Step 3: Cross multiply
    136,872.55x = 205,243.21 × 70,278.40
  4. Step 4: Simplify right side
    136,872.55x = 14,424,164,409.66
  5. Step 5: Solve for x
    x = 14,424,164,409.66/136,872.55
  6. Step 6: Final answer
    x = 105,383.91

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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.