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Finding the Fourth Proportional to 842.43, 1,264.34 and 355.81

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Solution

The fourth proportional to 842.43, 1,264.34 and 355.81 is: 534.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.43 : 1,264.34 = 355.81 : x
  2. Step 2: Convert to fraction form
    842.43/1,264.34 = 355.81/x
  3. Step 3: Cross multiply
    842.43x = 1,264.34 × 355.81
  4. Step 4: Simplify right side
    842.43x = 449,864.82
  5. Step 5: Solve for x
    x = 449,864.82/842.43
  6. Step 6: Final answer
    x = 534.01

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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.