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Finding the Fourth Proportional to 790.85, 1,089.59 and 551.35

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Solution

The fourth proportional to 790.85, 1,089.59 and 551.35 is: 759.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.85 : 1,089.59 = 551.35 : x
  2. Step 2: Convert to fraction form
    790.85/1,089.59 = 551.35/x
  3. Step 3: Cross multiply
    790.85x = 1,089.59 × 551.35
  4. Step 4: Simplify right side
    790.85x = 600,745.45
  5. Step 5: Solve for x
    x = 600,745.45/790.85
  6. Step 6: Final answer
    x = 759.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.