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Finding the Fourth Proportional to 129,456, 178,653.60 and 79,145.28

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Solution

The fourth proportional to 129,456, 178,653.60 and 79,145.28 is: 109,223.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,456 : 178,653.60 = 79,145.28 : x
  2. Step 2: Convert to fraction form
    129,456/178,653.60 = 79,145.28/x
  3. Step 3: Cross multiply
    129,456x = 178,653.60 × 79,145.28
  4. Step 4: Simplify right side
    129,456x = 14,139,589,195.01
  5. Step 5: Solve for x
    x = 14,139,589,195.01/129,456
  6. Step 6: Final answer
    x = 109,223.13

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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.