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Finding the Fourth Proportional to 751.86, 1,128.36 and 491.78

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Solution

The fourth proportional to 751.86, 1,128.36 and 491.78 is: 738.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.86 : 1,128.36 = 491.78 : x
  2. Step 2: Convert to fraction form
    751.86/1,128.36 = 491.78/x
  3. Step 3: Cross multiply
    751.86x = 1,128.36 × 491.78
  4. Step 4: Simplify right side
    751.86x = 554,904.88
  5. Step 5: Solve for x
    x = 554,904.88/751.86
  6. Step 6: Final answer
    x = 738.04

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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.