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Finding the Fourth Proportional to 128,651.78, 177,539.46 and 72,063.15

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Solution

The fourth proportional to 128,651.78, 177,539.46 and 72,063.15 is: 99,447.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,651.78 : 177,539.46 = 72,063.15 : x
  2. Step 2: Convert to fraction form
    128,651.78/177,539.46 = 72,063.15/x
  3. Step 3: Cross multiply
    128,651.78x = 177,539.46 × 72,063.15
  4. Step 4: Simplify right side
    128,651.78x = 12,794,053,204.90
  5. Step 5: Solve for x
    x = 12,794,053,204.90/128,651.78
  6. Step 6: Final answer
    x = 99,447.16

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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.