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Finding the Fourth Proportional to 212,433.84, 318,706.11 and 79,315.20

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Solution

The fourth proportional to 212,433.84, 318,706.11 and 79,315.20 is: 118,993.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,433.84 : 318,706.11 = 79,315.20 : x
  2. Step 2: Convert to fraction form
    212,433.84/318,706.11 = 79,315.20/x
  3. Step 3: Cross multiply
    212,433.84x = 318,706.11 × 79,315.20
  4. Step 4: Simplify right side
    212,433.84x = 25,278,238,855.87
  5. Step 5: Solve for x
    x = 25,278,238,855.87/212,433.84
  6. Step 6: Final answer
    x = 118,993.47

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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.