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Finding the Fourth Proportional to 212,559.89, 318,729.11 and 79,330.58

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Solution

The fourth proportional to 212,559.89, 318,729.11 and 79,330.58 is: 118,954.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,559.89 : 318,729.11 = 79,330.58 : x
  2. Step 2: Convert to fraction form
    212,559.89/318,729.11 = 79,330.58/x
  3. Step 3: Cross multiply
    212,559.89x = 318,729.11 × 79,330.58
  4. Step 4: Simplify right side
    212,559.89x = 25,284,966,154.33
  5. Step 5: Solve for x
    x = 25,284,966,154.33/212,559.89
  6. Step 6: Final answer
    x = 118,954.55

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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.