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Finding the Fourth Proportional to 751.85, 1,128.51 and 405.44

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Solution

The fourth proportional to 751.85, 1,128.51 and 405.44 is: 608.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.85 : 1,128.51 = 405.44 : x
  2. Step 2: Convert to fraction form
    751.85/1,128.51 = 405.44/x
  3. Step 3: Cross multiply
    751.85x = 1,128.51 × 405.44
  4. Step 4: Simplify right side
    751.85x = 457,537.45
  5. Step 5: Solve for x
    x = 457,537.45/751.85
  6. Step 6: Final answer
    x = 608.55

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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.