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Finding the Fourth Proportional to 830.64, 1,243.94 and 396.76

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Solution

The fourth proportional to 830.64, 1,243.94 and 396.76 is: 594.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.64 : 1,243.94 = 396.76 : x
  2. Step 2: Convert to fraction form
    830.64/1,243.94 = 396.76/x
  3. Step 3: Cross multiply
    830.64x = 1,243.94 × 396.76
  4. Step 4: Simplify right side
    830.64x = 493,545.63
  5. Step 5: Solve for x
    x = 493,545.63/830.64
  6. Step 6: Final answer
    x = 594.18

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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.