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Finding the Fourth Proportional to 128,953.56, 177,972.30 and 72,383.16

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Solution

The fourth proportional to 128,953.56, 177,972.30 and 72,383.16 is: 99,897.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,953.56 : 177,972.30 = 72,383.16 : x
  2. Step 2: Convert to fraction form
    128,953.56/177,972.30 = 72,383.16/x
  3. Step 3: Cross multiply
    128,953.56x = 177,972.30 × 72,383.16
  4. Step 4: Simplify right side
    128,953.56x = 12,882,197,466.47
  5. Step 5: Solve for x
    x = 12,882,197,466.47/128,953.56
  6. Step 6: Final answer
    x = 99,897.96

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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.