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Finding the Fourth Proportional to 129,608.78, 178,860.35 and 75,883.10

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Solution

The fourth proportional to 129,608.78, 178,860.35 and 75,883.10 is: 104,718.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,608.78 : 178,860.35 = 75,883.10 : x
  2. Step 2: Convert to fraction form
    129,608.78/178,860.35 = 75,883.10/x
  3. Step 3: Cross multiply
    129,608.78x = 178,860.35 × 75,883.10
  4. Step 4: Simplify right side
    129,608.78x = 13,572,477,120.49
  5. Step 5: Solve for x
    x = 13,572,477,120.49/129,608.78
  6. Step 6: Final answer
    x = 104,718.81

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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.