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Finding the Fourth Proportional to 744.78, 1,111.94 and 570.49

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Solution

The fourth proportional to 744.78, 1,111.94 and 570.49 is: 851.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.78 : 1,111.94 = 570.49 : x
  2. Step 2: Convert to fraction form
    744.78/1,111.94 = 570.49/x
  3. Step 3: Cross multiply
    744.78x = 1,111.94 × 570.49
  4. Step 4: Simplify right side
    744.78x = 634,350.65
  5. Step 5: Solve for x
    x = 634,350.65/744.78
  6. Step 6: Final answer
    x = 851.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.