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Finding the Fourth Proportional to 751.76, 1,128.66 and 386.78

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Solution

The fourth proportional to 751.76, 1,128.66 and 386.78 is: 580.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.76 : 1,128.66 = 386.78 : x
  2. Step 2: Convert to fraction form
    751.76/1,128.66 = 386.78/x
  3. Step 3: Cross multiply
    751.76x = 1,128.66 × 386.78
  4. Step 4: Simplify right side
    751.76x = 436,543.11
  5. Step 5: Solve for x
    x = 436,543.11/751.76
  6. Step 6: Final answer
    x = 580.69

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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.