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Finding the Fourth Proportional to 790.54, 1,185.82 and 426.04

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Solution

The fourth proportional to 790.54, 1,185.82 and 426.04 is: 639.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.54 : 1,185.82 = 426.04 : x
  2. Step 2: Convert to fraction form
    790.54/1,185.82 = 426.04/x
  3. Step 3: Cross multiply
    790.54x = 1,185.82 × 426.04
  4. Step 4: Simplify right side
    790.54x = 505,211.79
  5. Step 5: Solve for x
    x = 505,211.79/790.54
  6. Step 6: Final answer
    x = 639.07

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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.