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Finding the Fourth Proportional to 128,874.18, 177,834.42 and 72,274.62

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Solution

The fourth proportional to 128,874.18, 177,834.42 and 72,274.62 is: 99,732.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,874.18 : 177,834.42 = 72,274.62 : x
  2. Step 2: Convert to fraction form
    128,874.18/177,834.42 = 72,274.62/x
  3. Step 3: Cross multiply
    128,874.18x = 177,834.42 × 72,274.62
  4. Step 4: Simplify right side
    128,874.18x = 12,852,915,128.42
  5. Step 5: Solve for x
    x = 12,852,915,128.42/128,874.18
  6. Step 6: Final answer
    x = 99,732.27

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1.5x scale

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.