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Finding the Fourth Proportional to 128,889.42, 177,875.56 and 72,304.44

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Solution

The fourth proportional to 128,889.42, 177,875.56 and 72,304.44 is: 99,784.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,889.42 : 177,875.56 = 72,304.44 : x
  2. Step 2: Convert to fraction form
    128,889.42/177,875.56 = 72,304.44/x
  3. Step 3: Cross multiply
    128,889.42x = 177,875.56 × 72,304.44
  4. Step 4: Simplify right side
    128,889.42x = 12,861,192,755.49
  5. Step 5: Solve for x
    x = 12,861,192,755.49/128,889.42
  6. Step 6: Final answer
    x = 99,784.71

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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.