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Finding the Fourth Proportional to 771.35, 1,154.45 and 551.30

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Solution

The fourth proportional to 771.35, 1,154.45 and 551.30 is: 825.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.35 : 1,154.45 = 551.30 : x
  2. Step 2: Convert to fraction form
    771.35/1,154.45 = 551.30/x
  3. Step 3: Cross multiply
    771.35x = 1,154.45 × 551.30
  4. Step 4: Simplify right side
    771.35x = 636,443.89
  5. Step 5: Solve for x
    x = 636,443.89/771.35
  6. Step 6: Final answer
    x = 825.11

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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.