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Finding the Fourth Proportional to 128,861.52, 177,828.88 and 72,272.88

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Solution

The fourth proportional to 128,861.52, 177,828.88 and 72,272.88 is: 99,736.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,861.52 : 177,828.88 = 72,272.88 : x
  2. Step 2: Convert to fraction form
    128,861.52/177,828.88 = 72,272.88/x
  3. Step 3: Cross multiply
    128,861.52x = 177,828.88 × 72,272.88
  4. Step 4: Simplify right side
    128,861.52x = 12,852,205,304.77
  5. Step 5: Solve for x
    x = 12,852,205,304.77/128,861.52
  6. Step 6: Final answer
    x = 99,736.56

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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.