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Finding the Fourth Proportional to 751.89, 1,128.08 and 313.35

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Solution

The fourth proportional to 751.89, 1,128.08 and 313.35 is: 470.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.89 : 1,128.08 = 313.35 : x
  2. Step 2: Convert to fraction form
    751.89/1,128.08 = 313.35/x
  3. Step 3: Cross multiply
    751.89x = 1,128.08 × 313.35
  4. Step 4: Simplify right side
    751.89x = 353,481.83
  5. Step 5: Solve for x
    x = 353,481.83/751.89
  6. Step 6: Final answer
    x = 470.13

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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.