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Finding the Fourth Proportional to 129,810.78, 179,138.82 and 70,194.78

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Solution

The fourth proportional to 129,810.78, 179,138.82 and 70,194.78 is: 96,868.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,810.78 : 179,138.82 = 70,194.78 : x
  2. Step 2: Convert to fraction form
    129,810.78/179,138.82 = 70,194.78/x
  3. Step 3: Cross multiply
    129,810.78x = 179,138.82 × 70,194.78
  4. Step 4: Simplify right side
    129,810.78x = 12,574,610,059.36
  5. Step 5: Solve for x
    x = 12,574,610,059.36/129,810.78
  6. Step 6: Final answer
    x = 96,868.77

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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.