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Finding the Fourth Proportional to 751.41, 1,125.05 and 621.78

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Solution

The fourth proportional to 751.41, 1,125.05 and 621.78 is: 930.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.41 : 1,125.05 = 621.78 : x
  2. Step 2: Convert to fraction form
    751.41/1,125.05 = 621.78/x
  3. Step 3: Cross multiply
    751.41x = 1,125.05 × 621.78
  4. Step 4: Simplify right side
    751.41x = 699,535.38
  5. Step 5: Solve for x
    x = 699,535.38/751.41
  6. Step 6: Final answer
    x = 930.97

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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.