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Finding the Fourth Proportional to 212,367.70, 318,551.16 and 145,605.43

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Solution

The fourth proportional to 212,367.70, 318,551.16 and 145,605.43 is: 218,407.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,367.70 : 318,551.16 = 145,605.43 : x
  2. Step 2: Convert to fraction form
    212,367.70/318,551.16 = 145,605.43/x
  3. Step 3: Cross multiply
    212,367.70x = 318,551.16 × 145,605.43
  4. Step 4: Simplify right side
    212,367.70x = 46,382,777,036.04
  5. Step 5: Solve for x
    x = 46,382,777,036.04/212,367.70
  6. Step 6: Final answer
    x = 218,407.88

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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.