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Finding the Fourth Proportional to 115,512, 159,431.04 and 79,262.88

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Solution

The fourth proportional to 115,512, 159,431.04 and 79,262.88 is: 109,399.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,512 : 159,431.04 = 79,262.88 : x
  2. Step 2: Convert to fraction form
    115,512/159,431.04 = 79,262.88/x
  3. Step 3: Cross multiply
    115,512x = 159,431.04 × 79,262.88
  4. Step 4: Simplify right side
    115,512x = 12,636,963,391.80
  5. Step 5: Solve for x
    x = 12,636,963,391.80/115,512
  6. Step 6: Final answer
    x = 109,399.57

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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.