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Finding the Fourth Proportional to 211,316.80, 316,975.20 and 71,060.80

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Solution

The fourth proportional to 211,316.80, 316,975.20 and 71,060.80 is: 106,591.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,316.80 : 316,975.20 = 71,060.80 : x
  2. Step 2: Convert to fraction form
    211,316.80/316,975.20 = 71,060.80/x
  3. Step 3: Cross multiply
    211,316.80x = 316,975.20 × 71,060.80
  4. Step 4: Simplify right side
    211,316.80x = 22,524,511,292.16
  5. Step 5: Solve for x
    x = 22,524,511,292.16/211,316.80
  6. Step 6: Final answer
    x = 106,591.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.