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Finding the Fourth Proportional to 212,520.72, 318,744.09 and 79,402.08

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Solution

The fourth proportional to 212,520.72, 318,744.09 and 79,402.08 is: 119,089.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,520.72 : 318,744.09 = 79,402.08 : x
  2. Step 2: Convert to fraction form
    212,520.72/318,744.09 = 79,402.08/x
  3. Step 3: Cross multiply
    212,520.72x = 318,744.09 × 79,402.08
  4. Step 4: Simplify right side
    212,520.72x = 25,308,943,733.71
  5. Step 5: Solve for x
    x = 25,308,943,733.71/212,520.72
  6. Step 6: Final answer
    x = 119,089.30

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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.