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Finding the Fourth Proportional to 665,673.12, 918,522.72 and 379,198.80

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Solution

The fourth proportional to 665,673.12, 918,522.72 and 379,198.80 is: 523,233.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,673.12 : 918,522.72 = 379,198.80 : x
  2. Step 2: Convert to fraction form
    665,673.12/918,522.72 = 379,198.80/x
  3. Step 3: Cross multiply
    665,673.12x = 918,522.72 × 379,198.80
  4. Step 4: Simplify right side
    665,673.12x = 348,302,713,196.74
  5. Step 5: Solve for x
    x = 348,302,713,196.74/665,673.12
  6. Step 6: Final answer
    x = 523,233.86

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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.