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Finding the Fourth Proportional to 128,706.72, 177,620.08 and 72,116

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Solution

The fourth proportional to 128,706.72, 177,620.08 and 72,116 is: 99,522.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.72 : 177,620.08 = 72,116 : x
  2. Step 2: Convert to fraction form
    128,706.72/177,620.08 = 72,116/x
  3. Step 3: Cross multiply
    128,706.72x = 177,620.08 × 72,116
  4. Step 4: Simplify right side
    128,706.72x = 12,809,249,689.28
  5. Step 5: Solve for x
    x = 12,809,249,689.28/128,706.72
  6. Step 6: Final answer
    x = 99,522.77

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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.