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Finding the Fourth Proportional to 830.40, 1,245.60 and 343.46

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Solution

The fourth proportional to 830.40, 1,245.60 and 343.46 is: 515.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.40 : 1,245.60 = 343.46 : x
  2. Step 2: Convert to fraction form
    830.40/1,245.60 = 343.46/x
  3. Step 3: Cross multiply
    830.40x = 1,245.60 × 343.46
  4. Step 4: Simplify right side
    830.40x = 427,813.78
  5. Step 5: Solve for x
    x = 427,813.78/830.40
  6. Step 6: Final answer
    x = 515.19

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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.