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Finding the Fourth Proportional to 212,503.11, 318,653.01 and 123,781.92

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Solution

The fourth proportional to 212,503.11, 318,653.01 and 123,781.92 is: 185,613.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,503.11 : 318,653.01 = 123,781.92 : x
  2. Step 2: Convert to fraction form
    212,503.11/318,653.01 = 123,781.92/x
  3. Step 3: Cross multiply
    212,503.11x = 318,653.01 × 123,781.92
  4. Step 4: Simplify right side
    212,503.11x = 39,443,481,391.58
  5. Step 5: Solve for x
    x = 39,443,481,391.58/212,503.11
  6. Step 6: Final answer
    x = 185,613.67

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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.