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Finding the Fourth Proportional to 851.10, 1,174.53 and 640.93

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Solution

The fourth proportional to 851.10, 1,174.53 and 640.93 is: 884.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.10 : 1,174.53 = 640.93 : x
  2. Step 2: Convert to fraction form
    851.10/1,174.53 = 640.93/x
  3. Step 3: Cross multiply
    851.10x = 1,174.53 × 640.93
  4. Step 4: Simplify right side
    851.10x = 752,791.51
  5. Step 5: Solve for x
    x = 752,791.51/851.10
  6. Step 6: Final answer
    x = 884.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.