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Finding the Fourth Proportional to 128,773.56, 177,706.80 and 72,183.72

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Solution

The fourth proportional to 128,773.56, 177,706.80 and 72,183.72 is: 99,613.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,773.56 : 177,706.80 = 72,183.72 : x
  2. Step 2: Convert to fraction form
    128,773.56/177,706.80 = 72,183.72/x
  3. Step 3: Cross multiply
    128,773.56x = 177,706.80 × 72,183.72
  4. Step 4: Simplify right side
    128,773.56x = 12,827,537,893.30
  5. Step 5: Solve for x
    x = 12,827,537,893.30/128,773.56
  6. Step 6: Final answer
    x = 99,613.13

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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.