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Finding the Fourth Proportional to 129,621, 178,876.98 and 70,005

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Solution

The fourth proportional to 129,621, 178,876.98 and 70,005 is: 96,606.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,621 : 178,876.98 = 70,005 : x
  2. Step 2: Convert to fraction form
    129,621/178,876.98 = 70,005/x
  3. Step 3: Cross multiply
    129,621x = 178,876.98 × 70,005
  4. Step 4: Simplify right side
    129,621x = 12,522,282,984.90
  5. Step 5: Solve for x
    x = 12,522,282,984.90/129,621
  6. Step 6: Final answer
    x = 96,606.90

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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.