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Finding the Fourth Proportional to 842.96, 1,264.48 and 520.40

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Solution

The fourth proportional to 842.96, 1,264.48 and 520.40 is: 780.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.96 : 1,264.48 = 520.40 : x
  2. Step 2: Convert to fraction form
    842.96/1,264.48 = 520.40/x
  3. Step 3: Cross multiply
    842.96x = 1,264.48 × 520.40
  4. Step 4: Simplify right side
    842.96x = 658,035.39
  5. Step 5: Solve for x
    x = 658,035.39/842.96
  6. Step 6: Final answer
    x = 780.62

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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.