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Finding the Fourth Proportional to 669.81, 1,005.27 and 345.27

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Solution

The fourth proportional to 669.81, 1,005.27 and 345.27 is: 518.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.81 : 1,005.27 = 345.27 : x
  2. Step 2: Convert to fraction form
    669.81/1,005.27 = 345.27/x
  3. Step 3: Cross multiply
    669.81x = 1,005.27 × 345.27
  4. Step 4: Simplify right side
    669.81x = 347,089.57
  5. Step 5: Solve for x
    x = 347,089.57/669.81
  6. Step 6: Final answer
    x = 518.19

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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.