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Finding the Fourth Proportional to 211,278.80, 316,918.20 and 86,709.20

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Solution

The fourth proportional to 211,278.80, 316,918.20 and 86,709.20 is: 130,063.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,278.80 : 316,918.20 = 86,709.20 : x
  2. Step 2: Convert to fraction form
    211,278.80/316,918.20 = 86,709.20/x
  3. Step 3: Cross multiply
    211,278.80x = 316,918.20 × 86,709.20
  4. Step 4: Simplify right side
    211,278.80x = 27,479,723,587.44
  5. Step 5: Solve for x
    x = 27,479,723,587.44/211,278.80
  6. Step 6: Final answer
    x = 130,063.80

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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.