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Finding the Fourth Proportional to 129,631, 178,890.90 and 70,015

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Solution

The fourth proportional to 129,631, 178,890.90 and 70,015 is: 96,620.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,631 : 178,890.90 = 70,015 : x
  2. Step 2: Convert to fraction form
    129,631/178,890.90 = 70,015/x
  3. Step 3: Cross multiply
    129,631x = 178,890.90 × 70,015
  4. Step 4: Simplify right side
    129,631x = 12,525,046,363.50
  5. Step 5: Solve for x
    x = 12,525,046,363.50/129,631
  6. Step 6: Final answer
    x = 96,620.76

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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.