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Finding the Fourth Proportional to 129,373.92, 178,509.28 and 75,648.48

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Solution

The fourth proportional to 129,373.92, 178,509.28 and 75,648.48 is: 104,379.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,373.92 : 178,509.28 = 75,648.48 : x
  2. Step 2: Convert to fraction form
    129,373.92/178,509.28 = 75,648.48/x
  3. Step 3: Cross multiply
    129,373.92x = 178,509.28 × 75,648.48
  4. Step 4: Simplify right side
    129,373.92x = 13,503,955,697.89
  5. Step 5: Solve for x
    x = 13,503,955,697.89/129,373.92
  6. Step 6: Final answer
    x = 104,379.27

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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.