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Finding the Fourth Proportional to 212,574.72, 318,849.12 and 87,912.48

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Solution

The fourth proportional to 212,574.72, 318,849.12 and 87,912.48 is: 131,863.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,574.72 : 318,849.12 = 87,912.48 : x
  2. Step 2: Convert to fraction form
    212,574.72/318,849.12 = 87,912.48/x
  3. Step 3: Cross multiply
    212,574.72x = 318,849.12 × 87,912.48
  4. Step 4: Simplify right side
    212,574.72x = 28,030,816,885.02
  5. Step 5: Solve for x
    x = 28,030,816,885.02/212,574.72
  6. Step 6: Final answer
    x = 131,863.36

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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.