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Finding the Fourth Proportional to 129,655, 178,923.90 and 73,066.38

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Solution

The fourth proportional to 129,655, 178,923.90 and 73,066.38 is: 100,831.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,655 : 178,923.90 = 73,066.38 : x
  2. Step 2: Convert to fraction form
    129,655/178,923.90 = 73,066.38/x
  3. Step 3: Cross multiply
    129,655x = 178,923.90 × 73,066.38
  4. Step 4: Simplify right side
    129,655x = 13,073,321,668.48
  5. Step 5: Solve for x
    x = 13,073,321,668.48/129,655
  6. Step 6: Final answer
    x = 100,831.60

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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.