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Finding the Fourth Proportional to 751.60, 1,125.78 and 605.80

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Solution

The fourth proportional to 751.60, 1,125.78 and 605.80 is: 907.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.60 : 1,125.78 = 605.80 : x
  2. Step 2: Convert to fraction form
    751.60/1,125.78 = 605.80/x
  3. Step 3: Cross multiply
    751.60x = 1,125.78 × 605.80
  4. Step 4: Simplify right side
    751.60x = 681,997.52
  5. Step 5: Solve for x
    x = 681,997.52/751.60
  6. Step 6: Final answer
    x = 907.39

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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.