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Finding the Fourth Proportional to 128,926.76, 177,918.12 and 72,338

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Solution

The fourth proportional to 128,926.76, 177,918.12 and 72,338 is: 99,825.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,926.76 : 177,918.12 = 72,338 : x
  2. Step 2: Convert to fraction form
    128,926.76/177,918.12 = 72,338/x
  3. Step 3: Cross multiply
    128,926.76x = 177,918.12 × 72,338
  4. Step 4: Simplify right side
    128,926.76x = 12,870,240,964.56
  5. Step 5: Solve for x
    x = 12,870,240,964.56/128,926.76
  6. Step 6: Final answer
    x = 99,825.99

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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.