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Finding the Fourth Proportional to 211,245.80, 316,868.70 and 86,676.20

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Solution

The fourth proportional to 211,245.80, 316,868.70 and 86,676.20 is: 130,014.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,245.80 : 316,868.70 = 86,676.20 : x
  2. Step 2: Convert to fraction form
    211,245.80/316,868.70 = 86,676.20/x
  3. Step 3: Cross multiply
    211,245.80x = 316,868.70 × 86,676.20
  4. Step 4: Simplify right side
    211,245.80x = 27,464,974,814.94
  5. Step 5: Solve for x
    x = 27,464,974,814.94/211,245.80
  6. Step 6: Final answer
    x = 130,014.30

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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.