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Finding the Fourth Proportional to 129,961, 179,346.72 and 70,345

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Solution

The fourth proportional to 129,961, 179,346.72 and 70,345 is: 97,076.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,961 : 179,346.72 = 70,345 : x
  2. Step 2: Convert to fraction form
    129,961/179,346.72 = 70,345/x
  3. Step 3: Cross multiply
    129,961x = 179,346.72 × 70,345
  4. Step 4: Simplify right side
    129,961x = 12,616,145,018.40
  5. Step 5: Solve for x
    x = 12,616,145,018.40/129,961
  6. Step 6: Final answer
    x = 97,076.39

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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.