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Finding the Fourth Proportional to 318,606.30, 439,623.72 and 211,321.80

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Solution

The fourth proportional to 318,606.30, 439,623.72 and 211,321.80 is: 291,588.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,606.30 : 439,623.72 = 211,321.80 : x
  2. Step 2: Convert to fraction form
    318,606.30/439,623.72 = 211,321.80/x
  3. Step 3: Cross multiply
    318,606.30x = 439,623.72 × 211,321.80
  4. Step 4: Simplify right side
    318,606.30x = 92,902,075,833.10
  5. Step 5: Solve for x
    x = 92,902,075,833.10/318,606.30
  6. Step 6: Final answer
    x = 291,588.95

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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.