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Finding the Fourth Proportional to 129,640, 178,919.04 and 73,061.68

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Solution

The fourth proportional to 129,640, 178,919.04 and 73,061.68 is: 100,834.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,640 : 178,919.04 = 73,061.68 : x
  2. Step 2: Convert to fraction form
    129,640/178,919.04 = 73,061.68/x
  3. Step 3: Cross multiply
    129,640x = 178,919.04 × 73,061.68
  4. Step 4: Simplify right side
    129,640x = 13,072,125,646.39
  5. Step 5: Solve for x
    x = 13,072,125,646.39/129,640
  6. Step 6: Final answer
    x = 100,834.05

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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.