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Finding the Fourth Proportional to 129,449, 178,643.94 and 79,138.28

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Solution

The fourth proportional to 129,449, 178,643.94 and 79,138.28 is: 109,213.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,449 : 178,643.94 = 79,138.28 : x
  2. Step 2: Convert to fraction form
    129,449/178,643.94 = 79,138.28/x
  3. Step 3: Cross multiply
    129,449x = 178,643.94 × 79,138.28
  4. Step 4: Simplify right side
    129,449x = 14,137,574,144.02
  5. Step 5: Solve for x
    x = 14,137,574,144.02/129,449
  6. Step 6: Final answer
    x = 109,213.47

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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.