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Finding the Fourth Proportional to 755.80, 1,134.90 and 551.80

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Solution

The fourth proportional to 755.80, 1,134.90 and 551.80 is: 828.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.80 : 1,134.90 = 551.80 : x
  2. Step 2: Convert to fraction form
    755.80/1,134.90 = 551.80/x
  3. Step 3: Cross multiply
    755.80x = 1,134.90 × 551.80
  4. Step 4: Simplify right side
    755.80x = 626,237.82
  5. Step 5: Solve for x
    x = 626,237.82/755.80
  6. Step 6: Final answer
    x = 828.58

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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.