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Finding the Fourth Proportional to 100,191, 138,263.62 and 55,479

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Solution

The fourth proportional to 100,191, 138,263.62 and 55,479 is: 76,561.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,191 : 138,263.62 = 55,479 : x
  2. Step 2: Convert to fraction form
    100,191/138,263.62 = 55,479/x
  3. Step 3: Cross multiply
    100,191x = 138,263.62 × 55,479
  4. Step 4: Simplify right side
    100,191x = 7,670,727,373.98
  5. Step 5: Solve for x
    x = 7,670,727,373.98/100,191
  6. Step 6: Final answer
    x = 76,561.04

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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.