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Finding the Fourth Proportional to 751.91, 1,128.11 and 258.35

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Solution

The fourth proportional to 751.91, 1,128.11 and 258.35 is: 387.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.91 : 1,128.11 = 258.35 : x
  2. Step 2: Convert to fraction form
    751.91/1,128.11 = 258.35/x
  3. Step 3: Cross multiply
    751.91x = 1,128.11 × 258.35
  4. Step 4: Simplify right side
    751.91x = 291,447.22
  5. Step 5: Solve for x
    x = 291,447.22/751.91
  6. Step 6: Final answer
    x = 387.61

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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.