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Finding the Fourth Proportional to 830.31, 1,245.78 and 612.03

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Solution

The fourth proportional to 830.31, 1,245.78 and 612.03 is: 918.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.31 : 1,245.78 = 612.03 : x
  2. Step 2: Convert to fraction form
    830.31/1,245.78 = 612.03/x
  3. Step 3: Cross multiply
    830.31x = 1,245.78 × 612.03
  4. Step 4: Simplify right side
    830.31x = 762,454.73
  5. Step 5: Solve for x
    x = 762,454.73/830.31
  6. Step 6: Final answer
    x = 918.28

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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.