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Finding the Fourth Proportional to 1,211.60, 1,817.42 and 431.72

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Solution

The fourth proportional to 1,211.60, 1,817.42 and 431.72 is: 647.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.60 : 1,817.42 = 431.72 : x
  2. Step 2: Convert to fraction form
    1,211.60/1,817.42 = 431.72/x
  3. Step 3: Cross multiply
    1,211.60x = 1,817.42 × 431.72
  4. Step 4: Simplify right side
    1,211.60x = 784,616.56
  5. Step 5: Solve for x
    x = 784,616.56/1,211.60
  6. Step 6: Final answer
    x = 647.59

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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.