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Finding the Fourth Proportional to 851.70, 1,174.61 and 664.90

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Solution

The fourth proportional to 851.70, 1,174.61 and 664.90 is: 916.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.70 : 1,174.61 = 664.90 : x
  2. Step 2: Convert to fraction form
    851.70/1,174.61 = 664.90/x
  3. Step 3: Cross multiply
    851.70x = 1,174.61 × 664.90
  4. Step 4: Simplify right side
    851.70x = 780,998.19
  5. Step 5: Solve for x
    x = 780,998.19/851.70
  6. Step 6: Final answer
    x = 916.99

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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.