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Finding the Fourth Proportional to 830.90, 1,245.65 and 343.38

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Solution

The fourth proportional to 830.90, 1,245.65 and 343.38 is: 514.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.90 : 1,245.65 = 343.38 : x
  2. Step 2: Convert to fraction form
    830.90/1,245.65 = 343.38/x
  3. Step 3: Cross multiply
    830.90x = 1,245.65 × 343.38
  4. Step 4: Simplify right side
    830.90x = 427,731.30
  5. Step 5: Solve for x
    x = 427,731.30/830.90
  6. Step 6: Final answer
    x = 514.78

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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.