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Finding the Fourth Proportional to 128,537.64, 192,811.98 and 39,792.78

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Solution

The fourth proportional to 128,537.64, 192,811.98 and 39,792.78 is: 59,690.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,537.64 : 192,811.98 = 39,792.78 : x
  2. Step 2: Convert to fraction form
    128,537.64/192,811.98 = 39,792.78/x
  3. Step 3: Cross multiply
    128,537.64x = 192,811.98 × 39,792.78
  4. Step 4: Simplify right side
    128,537.64x = 7,672,524,701.50
  5. Step 5: Solve for x
    x = 7,672,524,701.50/128,537.64
  6. Step 6: Final answer
    x = 59,690.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.