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Finding the Fourth Proportional to 129,978, 179,370.12 and 70,362

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Solution

The fourth proportional to 129,978, 179,370.12 and 70,362 is: 97,099.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,978 : 179,370.12 = 70,362 : x
  2. Step 2: Convert to fraction form
    129,978/179,370.12 = 70,362/x
  3. Step 3: Cross multiply
    129,978x = 179,370.12 × 70,362
  4. Step 4: Simplify right side
    129,978x = 12,620,840,383.44
  5. Step 5: Solve for x
    x = 12,620,840,383.44/129,978
  6. Step 6: Final answer
    x = 97,099.82

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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.