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Finding the Fourth Proportional to 212,616.39, 318,824.55 and 79,461.30

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Solution

The fourth proportional to 212,616.39, 318,824.55 and 79,461.30 is: 119,154.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,616.39 : 318,824.55 = 79,461.30 : x
  2. Step 2: Convert to fraction form
    212,616.39/318,824.55 = 79,461.30/x
  3. Step 3: Cross multiply
    212,616.39x = 318,824.55 × 79,461.30
  4. Step 4: Simplify right side
    212,616.39x = 25,334,213,214.92
  5. Step 5: Solve for x
    x = 25,334,213,214.92/212,616.39
  6. Step 6: Final answer
    x = 119,154.56

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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.