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Finding the Fourth Proportional to 212,572.42, 318,747.92 and 79,343.12

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Solution

The fourth proportional to 212,572.42, 318,747.92 and 79,343.12 is: 118,973.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,572.42 : 318,747.92 = 79,343.12 : x
  2. Step 2: Convert to fraction form
    212,572.42/318,747.92 = 79,343.12/x
  3. Step 3: Cross multiply
    212,572.42x = 318,747.92 × 79,343.12
  4. Step 4: Simplify right side
    212,572.42x = 25,290,454,466.31
  5. Step 5: Solve for x
    x = 25,290,454,466.31/212,572.42
  6. Step 6: Final answer
    x = 118,973.36

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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.