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Finding the Fourth Proportional to 751.35, 1,126.86 and 385.86

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Solution

The fourth proportional to 751.35, 1,126.86 and 385.86 is: 578.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.35 : 1,126.86 = 385.86 : x
  2. Step 2: Convert to fraction form
    751.35/1,126.86 = 385.86/x
  3. Step 3: Cross multiply
    751.35x = 1,126.86 × 385.86
  4. Step 4: Simplify right side
    751.35x = 434,810.20
  5. Step 5: Solve for x
    x = 434,810.20/751.35
  6. Step 6: Final answer
    x = 578.71

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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.