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Finding the Fourth Proportional to 129,699.78, 178,970.49 and 73,107.78

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Solution

The fourth proportional to 129,699.78, 178,970.49 and 73,107.78 is: 100,880.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,699.78 : 178,970.49 = 73,107.78 : x
  2. Step 2: Convert to fraction form
    129,699.78/178,970.49 = 73,107.78/x
  3. Step 3: Cross multiply
    129,699.78x = 178,970.49 × 73,107.78
  4. Step 4: Simplify right side
    129,699.78x = 13,084,135,209.41
  5. Step 5: Solve for x
    x = 13,084,135,209.41/129,699.78
  6. Step 6: Final answer
    x = 100,880.17

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1.5x scale

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.