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Finding the Fourth Proportional to 129,986, 179,380.68 and 70,370

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Solution

The fourth proportional to 129,986, 179,380.68 and 70,370 is: 97,110.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,986 : 179,380.68 = 70,370 : x
  2. Step 2: Convert to fraction form
    129,986/179,380.68 = 70,370/x
  3. Step 3: Cross multiply
    129,986x = 179,380.68 × 70,370
  4. Step 4: Simplify right side
    129,986x = 12,623,018,451.60
  5. Step 5: Solve for x
    x = 12,623,018,451.60/129,986
  6. Step 6: Final answer
    x = 97,110.60

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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.